suggestions for improvement for the docker images of MinimServer

[airflow]

After some time using the docker images of MinimServer, I'd like to make a few comments about those images.

I think they could be improved. They don't really make use of the altered configuration/administration paradigms of containers.

Some ideas:

• Instead of having to enter the license key after initial startup via the GUI, this should be configurable via a docker-compose environment variable.
• Generally, the configuration of the server should be able to be mapped into the container for easy and reproducible recreation of the ready configured service (there were already some discussions about this on the forum).
• There should be a preconfigured healthcheck.
  

Generally, it's great the product is provided as docker images. Thanks!