Add codecov-action to test workflow

[micnncim]

No description provided.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@401ab33). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #107   +/-   ##
=========================================
  Coverage          ?   26.78%           
=========================================
  Files             ?        7           
  Lines             ?      504           
  Branches          ?        0           
=========================================
  Hits              ?      135           
  Misses            ?      345           
  Partials          ?       24           

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