CLI should use the "entrypoint" defined by `oms.yml` and not `Dockerfile`

[adnrs96]

The OMS CLI builds the docker image and uses the entrypoint defined inside the Dockerfile. It shouldn't be doing that and instead be using the entrypoint/command defined by oms.yml using the startup section:

lifecycle:
  startup:
    command: ["python", "/app/app.py"]

This is important since runtime does this and one could have different entrypoints at these locations and endup with a situation where things are working with oms and not in the runtime.