Improve-docker-entrypoint

[adamiBs]

• Provide preliminary checks for the modules, with appropriate warning messages. This is to support entry command overrides.

https://github.com/docker-library/official-images/pull/17549#issuecomment-2350726819

I've verified that the override command test passes locally: https://github.com/docker-library/official-images/blob/master/test/run.sh