Add dataclasses for the default environment variables

[killermoehre]

Closes #24

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.69 🎉

Comparison is base (a410d39) 94.86% compared to head (f06dac2) 95.56%.

❗ Current head f06dac2 differs from pull request most recent head ed2c224. Consider uploading reports for the commit ed2c224 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #25      +/-   ##
==========================================
+ Coverage   94.86%   95.56%   +0.69%     
==========================================
  Files           3        3              
  Lines         292      383      +91     
==========================================
+ Hits          277      366      +89     
- Misses         15       17       +2     

Impacted Files	Coverage Δ
github_action_utils.py	93.36% <100.00%> (+2.99%)	⬆️

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