add docs build workflow

[jishnub]

No description provided.

[codecov]

Codecov Report

Merging #787 (6d7875d) into master (e4787f2) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #787   +/-   ##
=======================================
  Coverage   34.85%   34.85%           
=======================================
  Files          15       15           
  Lines         855      855           
=======================================
  Hits          298      298           
  Misses        557      557           

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