Calibre-web

You can install with the attached docker-compose. You will only need to add a .env file to inform of the ROOT_PATH where the volumes should be mounted in the host.
Calibre-web is initially suposed to be a layer on top of an existing calibre installation. Because of that, the container does not initialize a books library on its own. This prevents the service from working properly (you will get stuck in the first screen, being asked for a config and getting an error message constantly). To overcome this, you simply need to drop an empty calibre database in the /books path in the container. A file you can use goes along with this readme file.
By default, you can't upload books through the web UI. You need to go to Admin > Edit Basic Configuration > Feature Configuration > Enable Uploads. After that, permission needs to be given to every user who should be allowed to upload books.
The app allows OPDS connections from ebooks. To set it up, pass to the ebook the web URL with /opds at the end.
Books can easily exceed the default max upload size allowed by nginx. To increase it, you simply need to put the following directive under nginx's reverse proxy section for calibre: client_max_body_size <your megabytes choice>M;