>
>
> Is anybody able spotting, what am I doing wrong here? Thank you
>
Unless I'm mistaken, it seems like you are trying to run jetty and postgres
in the same container. You should really use two containers and run them
both with docker compose. Docker is very much designed to run a single
service. This should also greatly simplify your Dockerfile - you could
probably just use the vanilla postgres image for the postgres container.
Here's some info on how to achieve this:
https://www.docker.com/blog/how-to-use-the-postgres-docker-official-image/#Using-Docker-Compose