chore: prepare deps and make to deploy meltano

flake.nix

@@ -10,18 +10,40 @@
     flake-utils.lib.eachDefaultSystem (system:
       let
         pkgs = import nixpkgs { inherit system; };
+
+      python-with-deps = pkgs.python3.withPackages (ps: with ps; [
+        pip
+        setuptools
+        wheel      
+        psycopg2   
+      ]);
+
+      venvDir = ".venv";
+
       in {
         devShells.default = pkgs.mkShell {
-          buildInputs = with pkgs; [
-            rustup
-            pkg-config
-            openssl
-            postgresql
-            sqlx-cli
+          packages = [
+            pkgs.rustup
+            pkgs.cargo
+            pkgs.docker
+            pkgs.postgresql
+            python-with-deps
           ];
 
           shellHook = ''
             echo "✅ Rust + PostgreSQL dev env ready"
+
+            if [ ! -d ${venvDir} ]; then
+              echo "🐍 Creating Python virtualenv..."
+              python3 -m venv ${venvDir}
+            fi
+
+            source ${venvDir}/bin/activate
+
+            pip install --upgrade pip
+            pip install -r requirements.txt
+
+            echo "Python env ready"
           '';
         };
       });