well. it’s ansible and not docker-compose. but i guess you can get the answer to your question anyhow.
you create the config files you want to customize
and copy/map them into the container
not sure if you have to stop and remove the old container. but yes that’s the way you run an update. the update is performed by the entrypoint skript.
you mean env vars to pass into the docker container?
that should be in the readme
or in the entrypoint skripts of the container.