Discussion Remove redundancy in docker-compose

Since we have 3 different docker-compose files with mostly the same values / env-var names we should think about having one compose file for those and extend it with the specific configuration. The docker-compose documentation describes how this can be done: https://docs.docker.com/compose/extends/

Question for the discussion is more if we want to go this extra step and if yes we should create an issue with an appropriate priority.