Add GitHub release step to Gradle release workflow

[cjaehnen]

• Add GitHub release step to Gradle release workflow
• Add code coverage workflow

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.00%. Comparing base (a3934ba) to head (65e35a1).
Report is 9 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #13      +/-   ##
============================================
- Coverage     63.63%   56.00%   -7.64%     
  Complexity        7        7              
============================================
  Files             5        5              
  Lines            22       25       +3     
============================================
  Hits             14       14              
- Misses            8       11       +3     

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