forgejo-runner: convert to a role, de-Uptime-Kuma the health check

409-line playbook becomes a 16-line playbook plus a 318-line role with phases
split across tasks/{prerequisites,install,configure,service,healthcheck}.yml and
four templates. forgejo_runner_vars.yml is deleted; its content is the role's
defaults.

Applies the Plan 6 Stage 0 decision: keep whatever determines whether the
service is healthy, drop the Uptime Kuma specifics, make the reporting point
pluggable. Gone from the role: the embedded Python that created monitors over
the Kuma API, the /tmp credentials file, token extraction, the systemd
Environment= rewrite, and 8 `when: uptime_kuma_enabled` guards. What remains is
the check itself, its log, the systemd unit and timer, and an honest exit code -
`systemctl is-failed forgejo-runner-healthcheck.service` now answers the
question with no monitoring system involved at all.

Reporting is one variable, healthcheck_push_url, empty by default. Any endpoint
that accepts an HTTP ping plugs in there. A pull-based monitor wants it left
empty and reads unit state instead.

PREMISE CORRECTION: Uptime Kuma is NOT dead. Plan 3 recorded "48 push timers
curling an endpoint that no longer answers" and Plan 6 said the check had
"nowhere to report to". Both wrong - 24+ push scripts across 11 hosts are
pushing successfully right now (HTTP 200). Only the Ansible code and the vault
credentials were decommissioned; the service never stopped. So the existing push
URLs were harvested into a vaulted healthcheck_push_urls dict and are preserved,
keeping this refactor behaviour-neutral. Retiring Kuma stays a deliberate act
rather than a side effect. PLAN_3 and PLAN_6 are corrected.

Verified:
  - task-list diff vs the old playbook shows ONLY the five Kuma tasks removed,
    everything else identical and in the same order
  - first run ok=22 changed=1 (the rewritten health script); both systemd units
    and forgejo-runner.service came back ok, so the templates reproduce the
    previous files byte-for-byte
  - second run ok=22 changed=0, fully idempotent
  - still reports "Ping sent successfully (HTTP 200)" from a script containing
    zero Uptime Kuma references
  - the 4 skipped tasks are genuine already-configured guards, checked not assumed

Two things for the next service:

- import_tasks, not include_tasks. Dynamic includes are opaque to --list-tasks,
  which is the primary verification tool here; the first attempt produced a
  useless diff.
- `Assert runner is running` was guarded by uptime_kuma_enabled and so had not
  run since the decommissioning. It is not monitoring, it is the deployment
  checking its own work - the deprecation banner swept it up with the Kuma
  plumbing, and a runner that failed to start was deploying "successfully" in
  silence. Ungated now. The banner was applied to contiguous blocks, so read
  every uptime_kuma_enabled guard and ask whether it is monitoring or deployment.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

ansible/group_vars/all/vault.yml

@@ -1,60 +1,162 @@
 $ANSIBLE_VAULT;1.1;AES256
-61356165613635386631393135656434646436303665313031346566323336313138353433316463
-3363323534613064643132663335623238366431393062340a346538396662306537663163623366
-38626166383933616331623231373137306562623637313263333237633661663436666266616433
-3862346438643638650a306634333535653633613534646630386131333236366538333765323333
-38656163303837303732663561373232393132343331663164656262393730326434373731333636
-36613538646431396536363936336562616431656665653965373864633366663836353434626434
-34383932373461333564303439623565383661646365386665393831383463663662356536356236
-36373964666236626465366161636135393734356536633466383262326537343833636630343738
-62353066316131613737373162643363653662656261363465386364323962656537373061373032
-33343763353464383438363438343965653532393831343930393562633630383932653862623637
-38386239353237356631646436356166373961333464396639383538383662326534343339313330
-65373339356364636634616532363832386631323062363530313861336238353261353334306235
-62616338396431316537346638656365356564346666366366343638356261623664393263323937
-30343261363562383332323462336435376664386134646562643836363834313237373631353731
-35653535663864643266313332356635363262363533663232656531373130336539633066376139
-32316665393831663035623962656364363831333563366135636164346335383738363336663566
-63356532643563393939383635386462663561386434323939303431653438653131363538383034
-33623933333464363032656636643033326162626163353633343062633966343332383138363963
-36383831663562616533316436366566323061386535343538393861383462333166343562316633
-30623665623035393537393965626363323132656433313339396233356666346634316332616336
-37363635363330323230373332326565343530653335383437373230366563366237633665626331
-66623336626230663361636439316337393865383035326136653264666438666566646132353036
-38616264313833316536623238633339373466613866626366383835656638623863323838653030
-63303938376164653966356435386333363731656666313234663535666165646233313137343563
-36386437393139656438333262383437656666343831313239323961373637653163643664356565
-62346431393133656530316262303763646165643336396661666431383436323562336137653031
-62626538373839613734396366653065306534636630346338316237616161613037616364356431
-38643965376133616161336633383664326230383435363334353137303162663738313331346238
-39356161616533616134356231323530306338333162343363353531303263636632613036386638
-63633136386232306234323936303563646466313935326631396565383432386130656638616266
-32383334363237336539396665336366643764633131643663643137376438323666326435626461
-64346633636431393137633537306431646564386565303933636434386462346630626537346438
-32623333666133303061646564366366326665363163396262633164323631636337346130303239
-38373936663337356134666132303165393365663763396362623434633737373538653566646134
-62316164396438303532616266313062326666633130656338653139376634306664633031333037
-31636166306565353334633435656233336233363664306264626237623366336161303134353433
-63383739666462623336386537346662633666626466393039653439346436653937633537396436
-35393339383066326630353066623132333034656539363561346462626265363263303535343961
-39316461616630326539613731303039613736393633373338646266323938326162373831346336
-30656130343463366534323030646238313465306266383034623065636665623366333063383736
-38373063393837306462303564643962373334343139626338623935336435643730646532633630
-66363730386636633639346463363365343239373265303738353732653633653437636130636664
-39386365353334653765343335303263363461313965383664326563333734626533376436626530
-63353163323637303730353564383733653365613635353764333266393532653663326533646132
-39313763373735323835626437306435373238653432393936643165663663656665316132653330
-35383038353532656434366336346235363563636264303734633138323963396562306232646236
-38366536306561653937336333373434336164663336613839353439356435333833396363636437
-38323934613735643363656233333037336465336564313966623063376566663030303230323262
-65643564666534326234306164343365383632333061316238623565353538313538396364313337
-35336230313339643736653238386231343661623337306236383665356632366236356335323530
-66373831616239376231636361333430343433303233393066323865663434643433303832373262
-36366534646161323130393931626362626139663139643263366639656531613436313533363130
-65643736363833333939613566663339623964333262643863333030623138633464386238613934
-31323639333234336264313663376465323737353766643839303665313737336534386665363034
-30326439666433373232306136306365343764643434306561343339353132346430646436343362
-32333765616262363930353435616563333736313533653339656231316230346166363335356638
-37333561366339613136306438306130343230663732333862663838396463623661303961336433
-65646332373139303462303633346432366530643130366133363937653739653036366136373434
-343864373734666431326239373866313734
+32333164303734353564643266316239636365313631613866306666643538353537323939373066
+3439396330326266396531303737363131313831396365650a343832363564356337396530383438
+36356465623634623361643436383262393339663134373630666363613464653437666164393731
+3462326463346535310a396531393761643062643563613964613234666531643139666535323734
+63653630616138373539343434636434326466353134643864396466373435613738653536356532
+36313432373138316532663464353638386530666231376636643931663338303663346665363039
+39323734343934393037633766626132333835363265653538373266323236336137356630353834
+63306164313434363130306339346435643463376137366534643033366537383861363531353861
+34363966303234333133336466646635623136396138663637613133613861313866646634643132
+34383461366133333430633631353561653037346339626165346564353630373363643065323535
+61386237353135636665363538623538313039343965363535323734653763366238373334323065
+64626135383736316135303731656231313263306266636563343465653666326663333536383435
+32643537616161623830656161633763303566656462356235633866303165383663386435363133
+61353430656337656364646231383332316534316233393333646436353062316461366439613030
+62346366383566356661376463616137373062303363346333636134633465396238343761363139
+38616336633532366165376237626337333933353935613066303865303536303464633834643533
+31376236333133336166373635626130316632396561393930353065616465663336393938323539
+35343531306261343733626539346265386436643135326461353734346164633233383237393731
+32303030623564666539383835333064323630393539393062313435383663303334383134666436
+63336564353464313534323866383533323365393761643565633430346263346666623638303030
+38653461616661346661316537306666313165613163303835363636616561343335623131636633
+36636263356530366663616461316635316365393666313066326265306335363038366561356339
+37366231656330643764613664653735633963666638623961653134316136666336396438333864
+65653738623638373636366666663463373035363862396565396166643332343934626261353938
+34666638383531366532663963323533323965373439623735353661373862393830623934313535
+62363237663764356338383133336463303234393262623061363062373938613262383836323431
+35336133306139386336373965393132393431343535306162383337643961323039373530646330
+35383962303263353234376164633530666264386338376335653465616161383532613830636562
+36613837326564313565633632353964346537303337316233623033383961363737313861393234
+64313130306264636134626638396661353362346439373463663965653165613436363633323238
+39356430613033643334363731346333346639643563633162333636653066386233373063653138
+38623630353265663332366630316362633135633362313735306533333962373433376237366266
+64643266323862383363633033656465303032336134623036646530323264323532653234306363
+64326663343064643865373164306661613463366561383737363535303861646634353139636666
+66626466303037363064303865313830356531313834353165303839326238613962313261353536
+63626133663765373763623930623963653038313661656131666261356236366565626663323831
+32313130366135616662616639386436656265346635613762353832626466323261346333373661
+33656338326631393064313762343161363832643030303737663639356261633131353937396135
+34666361353266373661626534353134663235343662636435383032636261636637636361613631
+30373965373638386664313432386264303761376266363161363633343831633032356639343836
+36306163303363353534313466353863633834393337303161313431343165346162653537346130
+36393439386232613865613837346563643031393530646433353936383463303562326331313738
+30646537616264333332323562363237323530313333386531323066343335323133366566383935
+34613232323965626339653132323162626234356135323436353263306137343130346337326531
+62396164386661303366363566393833353130643636613865616433633166666532653937646262
+63323530616533373962626264633236313064306336633063356536343862316237383166346264
+65666466366435653134303164613632666336626630373764333534393164303132656530343031
+32386137633135376531373662336131313030303436333833663234343938323232343832633234
+35623361393533316232393431646561616535643638383533353266646235313736356366343231
+30383962353833326161663534396565316139393439366631313731663737656332646361326331
+35623038343931666231653731346435653162326237376339663936343933346264343564666132
+62393230363262323366313963373737646138336163313434376462383964396337313030383831
+35643865303738393736323032353239633631306262663536663732623933383431383563646664
+65326230323239353831623232633935636632636438636165376633313364643637373233323231
+30323534333131623138636266396565373964633963626536383930316663656634636638316363
+36326438363463386138633133346666383163323936653131666339333430316363393966316130
+66333732333565646564303633373464666461373437656634306564336432323465386631323034
+32376635666139313465393539353438626534646332323537363163653233353030366231306234
+31663065393062633438343438303762633931653564366666336662323430366466333334303763
+64356138373035323862326137643963323865666539316439333064343961303838636265623735
+36636233373065303239363461373239646662346162326164613332373761326561656234636438
+39636231386531353236303933343661393333383730636366626263393534656363366337316432
+66393162313731616165343362643162376334346262353730653738323138646463666433383963
+31626131373736633662366366376566656438343330383330616235376239353661663663313233
+63373836363638366432376130633930343862613436633263613538336536616163656364656561
+35353163323663663833343834373036366531623536303138613035353064303065623761376462
+32656363613765316635666639383865636538326130386535316132623238393730353631346136
+65353864393863376632356437303565626262343039636436636335383337623465336263623439
+61393030636466303836663166613766326164626639313965373734643466373663343565343631
+35356431303139396131346335346664373830663361616136306535643431353037636431343132
+32613164333232346335663236343238653033643133316564666534323130373861623962393461
+62386336326461326239383534303631346639343765393839656364353762356266653733303238
+37393533366164393863373134633439383765616435346239333065623438353431663035306132
+30363663383765356365333234323061326163653463646566373764363037373932623032366133
+64626633643737323631306539333531343239326639643166393435323731353932336262633963
+62363561616635356230626431626232383439633738306532636361336334616238643665323266
+35666165396566323639303733623364353436613966336337656363633762393664303939656537
+33656431663431396237643536613233376561313261323635613634613439633533393361333435
+33616136633936386135623563616530663833643339623439366430646639646162613863643565
+32343732613134656332653163623437366637656537666334653239366638653537393639396234
+63613362623037663465626438646136396362663033376261376166306138363436666566393838
+63363262386261316432313235323166333334346539343663303265303535636439653130366566
+38383632326433323036356266646138366233656131663633613236303137336437383333653430
+35653738623635656661393232333334643937303631663464383239353635393735353833333265
+38303831623130303634666464316465653639383230623662326534333136616561666166613930
+37643632393265326364376230643634356538626337633638663634326538396536383633303633
+62613532336435326161626263376462363162303762613835663831623539623562336361333031
+37346438343230363433633738643064336235323438346534643463333930626430653131623538
+61363735336332633663383136613633376430303133366634643839636562656431663737336431
+65653164393331626532356566623830623931373431393330633638306663376566346136643863
+61653461633637643663303761326464636339336635383938633039613132336139663762363734
+34313831366232383562363834653232613665616266323033336635653933626630346132643164
+66336663363161616431316666383430326266636134396239656561643763386438306434373166
+65616637356366353336346539396665396364383162383533323837303134313664326338366131
+64336333316531353661616561656430386462666565373535613134336634383136613638323565
+34303130316162376137303137396330343466383263363638306334386161613535303735623537
+30613065383963666166336135663632303038326163346630376466393761663738653532333466
+35346161373237383766393063623939363664356639653862353132353930383261643761363135
+66323364376432363437656239626362313835333537663030386435623764373937636130663331
+31663636616261636663306230653264353566313966333665383938393731336538363665636665
+33383334613565393139613138633636656234386263663932323364653361623433326438326132
+34636633663838636634323236636564333630666362356333333230346333373833653365363135
+37326630386439356139653865643039666237313833306161643263663363393965633163366436
+65373132623265363134343233653366383665633163363766353066653863373937613631373332
+34653835636565353731396331633133393435373739306663343632323234633462356630666238
+36316634303031346138393835363565366131663534323933623166653662323931386135363432
+36626434323536326636653165626661386663393134653061326634633162653666393661353762
+31343766383933633261366437396332356362663539623032663435356231656430366532623535
+35636361343330333263636230383030326139323065373032376238333162343462383566333264
+66386439303163616638353635303736376461326533623234633264353865393065363765366636
+63383034373631656331386439633863613731633930646330613931303430366236643735633434
+33346638356330643534396236633630616134626237613363306334383639336161306235626133
+32616339633033343431633131666131383036373335303739663634653831376563363034363365
+63366532393761323862373434656264323938313334333234323162353663306263636435653636
+65343531663234636362623139653439386132316430346536623864383539313037666439643638
+35323235303164396361383832303362613235386530303538376265373964623363653365383961
+61306365346532336164303763396364363038646563323562653865303461353339366334376534
+61346230343662336633316133666631613136316537393464666635643336393566613730333837
+62643232623831333730313737666536353137613138333566323934353236616464656238303339
+63346665326661653832646466636165366338376638353431346130323230646534303137386634
+66646362663831623234333335376561336664343232323361326430313138633266343065366535
+39396463636330663738333033616334623366643636623735396435643865396630656234333433
+63346437663331653233313430666633366264343565373838656536323231633966663262346434
+35386631333063666233303364346139336461333736366438396239353136373339636638323534
+61663564353733363131363139663761646561313337656232336164653234646563666266656362
+36613666303165383530386530646331346661323633393232376533386661376533663166346337
+63316431393964333731373332313732643765386662656437373136663532663531383436393761
+36323939643464343035313633313436373038646234343366356264386131623462343161313261
+62383839343863386365366432396666303065616137396631373330643339656433363463313131
+30653431393630653331633634363233323632306434626566393662323566613565633639313938
+65626434353530306630636430646261373365386538613232383663336339303838626533306164
+62386166363861613863393331343362303665613239626265316366386165633264636163343366
+30643965633239333162633433366132323162396564383530373839333331643632333930643035
+33313663623165613033353130616666643136303137356462613237653430366663653061653035
+64653961343163646530623863313663303231633764626264363366613162313535653631656365
+39633561643833313334363465626263656132623463633335333465306266373634386238666165
+37373134646438303134653734323665666531626533666663363534316238666232316438393939
+32633531313565636531646361356566663133316164623133653935313335323835616238336431
+61663664393239343837353039303334353035323861323533663161376361353933313032306136
+36623463363235303166616162373665616333346366336333333531623932376664383861616232
+38393263336364343566653735396561363836373064346131336366316231303539386531643835
+34363463636232653137656339643630336333653163383332663763663633393837343963336666
+61316236366436363064396464383138373639373864636261383533333139306237303030373037
+36333563653036393734393439636262303837356133636233663064623136356133613932656365
+62356630323134373063663664316133663761383035633065383838333364663732353866356230
+33333263316666323133323433653330646161386462303163303235343031343761633234306166
+63363138376531353130663431636637646262366436393161376633306332346465316333656432
+34333238306263666537626231376665376435623466643131363736656432353938653236656132
+37313633323863656463633030336566343265666534663737396530316234343433383931336462
+35306236626564373766393438653134353332616532373132336663626130666532373933323863
+39656463386136646131356462653933306532383232313334326334613738356339623566636661
+62373139326138326663666237663436656631343635373733626439643466326439663361313266
+61323966336532653263633530646363366439326663356664313065306166313863396439396564
+30303138326261303661333831306536333363663536323235356263623533346233386161396131
+64356265363964316231333933613463623163316538393830393539306533313035303765656437
+38623262333662613665396537323331393937366533303039386138643639383664663263643734
+65313531343636393232343230613639363466616235633162353430646364363934393530643263
+39633539333237653733363132303163613564623232313464376336306431666534653338323765
+35646564653736383962343664383666333936363864396334333463313637343336396434633766
+35396466306235323338393937643362373764613161333462303665646239636562306635663330
+3630