set push_preview=true in doc generation

[ablaom]

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[codecov-commenter]

Codecov Report

Merging #3 (9e30d5b) into master (c43792e) will not change coverage.
The diff coverage is n/a.

❗ Current head 9e30d5b differs from pull request most recent head 3bb4221. Consider uploading reports for the commit 3bb4221 to get more accurate results

@@           Coverage Diff           @@
##           master       #3   +/-   ##
=======================================
  Coverage   31.96%   31.96%           
=======================================
  Files           1        1           
  Lines         122      122           
=======================================
  Hits           39       39           
  Misses         83       83           

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