Add codecov github action

[jbusecke]

No description provided.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@7a6ee7b). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #49   +/-   ##
=======================================
  Coverage        ?   90.03%           
=======================================
  Files           ?        7           
  Lines           ?      251           
  Branches        ?        0           
=======================================
  Hits            ?      226           
  Misses          ?       25           
  Partials        ?        0           

Flag	Coverage Δ
unittests	90.03% <0.00%> (?)

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