DONE 1. Change db settings in CMakeLists.txt in concordia-server repo
DONE 2. Rebuild docker-compose and check if concordia-server connects to db via internal "docker-compose" network
DONE 3. do not expose concordia-postgres ports if the above works
DONE 4. Move scripts in the tests folder of concordia-server repo to the concordia-docker. Adjust them accordingly (host, port)
DONE 5. sort out the lemmagen