Add release trigger for CI workflow

[giordano]

This will allow building docs for stable releases, which is useful for referring to specific versions. If you create a tag v1.0.0+docs on the merge commitof this PR it'll create the docs for v1.0.0.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.77%. Comparing base (40b5177) to head (bd15d8f).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #378   +/-   ##
=======================================
  Coverage   88.77%   88.77%           
=======================================
  Files           7        7           
  Lines        1310     1310           
=======================================
  Hits         1163     1163           
  Misses        147      147           

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[quinnj]

Thanks @giordano!