Move releases to GitHub actions.

[jezdez]

This refs #479.

[codecov]

Codecov Report

Merging #481 (784a905) into master (3dc6268) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #481   +/-   ##
=======================================
  Coverage   90.66%   90.66%           
=======================================
  Files          28       28           
  Lines        2613     2613           
=======================================
  Hits         2369     2369           
  Misses        244      244           

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[claudep]

Thanks!