Support custom ports in Docker healthcheck

[eikendev]

Currently, the Docker container running with a custom port will always be shown unhealthy. This fix introduces a default port, which is overwritten when a user specifies a custom environment variable via Docker.

Please verify again that this works. I had to test a downstripped version, because my Podman didn't like it as is.

[jmattheis]

Thanks for your contribution @eikendev, it works well.

[jmattheis]

Build currently fails because (I guess) formatting errors inside generated files, I'll fix this tomorrow/on the weekend.

[codecov]

Codecov Report

Merging #321 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #321   +/-   ##
=======================================
  Coverage   90.80%   90.80%           
=======================================
  Files          44       44           
  Lines        1719     1719           
=======================================
  Hits         1561     1561           
  Misses         85       85           
  Partials       73       73           

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