Build on GitHub Actions

[Aaron-Rumpler]

Currently builds and uploads as artifacts, as well as creating a DMG for macOS with jpackage.

[codecov-commenter]

Codecov Report

Merging #938 (7287989) into master (c107474) will decrease coverage by 0.0%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             master    #938     +/-   ##
==========================================
- Coverage      56.6%   56.6%   -0.1%     
+ Complexity     6551    6550      -1     
==========================================
  Files           680     680             
  Lines         35355   35355             
  Branches       4762    4762             
==========================================
- Hits          20040   20038      -2     
- Misses        14111   14112      +1     
- Partials       1204    1205      +1     

Impacted Files	Coverage Δ
...va/de/neemann/digital/core/wiring/BusSplitter.java	96.4% <0.0%> (-3.6%)	:arrow_down:

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