ci: run aarch64 tests on GitHub Actions

[mayeut]

Speed-up & extend testing by moving aarch64 from Travis CI to GitHub Actions.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.01%. Comparing base (5f7c341) to head (4a11552).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #530   +/-   ##
=======================================
  Coverage   92.01%   92.01%           
=======================================
  Files          20       20           
  Lines        1315     1315           
  Branches      247      247           
=======================================
  Hits         1210     1210           
  Misses         65       65           
  Partials       40       40           

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