Make configuration more flexible to simplify deployment in other containerized execution environments

[apae89]

Hi, I provided small optimizations to make it easier using the application in other containerized execution environments (e.g. k8s), since given combination of application configuration and Dockerfile only allowed deployment in docker-compose environment using the existing compose files. I also upgraded npm in the Dockerfile to a newer version to get rid of warnings during Docker build process.

Best regards, Andreas