Deploy docs when new release is tagged

[weijinglok]

This PR fixes the issue where docs are not deployed when a new release is tagged.

Previously, it only deploys if there is a trigger from the master branch. I've added an OR condition to also deploy if it's a trigger from a new release tag.

[codecov]

Codecov Report

Merging #219 (31d2f2d) into master (966acf8) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #219   +/-   ##
=======================================
  Coverage   95.40%   95.40%           
=======================================
  Files          12       12           
  Lines         915      915           
  Branches      184      184           
=======================================
  Hits          873      873           
  Misses         16       16           
  Partials       26       26           

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[jwmueller]

LGTM, wonder why mockup did not catch this issue?