Use Github actions for build & tests

[oliver006]

This is step 1 of the migration to GH Actions.

Will migrate the release process in a follow-up PR.

[coveralls]

Pull Request Test Coverage Report for Build 10765367290

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 84.04%

---

Totals
Change from base Build 403:	0.0%
Covered Lines:	2001
Relevant Lines:	2381

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💛 - Coveralls

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.39%. Comparing base (3cf2d54) to head (148689b).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #737   +/-   ##
=======================================
  Coverage   80.39%   80.39%           
=======================================
  Files          17       17           
  Lines        2372     2372           
=======================================
  Hits         1907     1907           
  Misses        380      380           
  Partials       85       85           

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