Add GitHub action with support for commit/tag push workflow trigger

[rgryta]

I'd like to somehow contribute to the project considering that I'm pretty much using this package on daily basis. As such I think it would be nice to add a native CI/CD support for GHA.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.94%. Comparing base (b6773ac) to head (e3ff9a1).
Report is 6 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #232   +/-   ##
=======================================
  Coverage   93.94%   93.94%           
=======================================
  Files          26       26           
  Lines        1702     1702           
  Branches      330      330           
=======================================
  Hits         1599     1599           
  Misses         75       75           
  Partials       28       28           

Flag	Coverage Δ
python-3.10	93.94% <ø> (ø)
python-3.11	93.94% <ø> (ø)
python-3.8	93.86% <ø> (ø)
python-3.9	93.86% <ø> (ø)

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[rgryta]

One design decision that I've made with this is that I have not migrated any flags from the CLI to be GHA parameters - all of them (except for args) are connected to their own environment variables, so it's already possible to do so using those. See example in README.md.

[coordt]

@rgryta Thank you for your contribution! I added a few comments and thoughts.