ci: setup codecov action

[jjmachan]

No description provided.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@7b69c8e). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #65   +/-   ##
=======================================
  Coverage        ?   63.93%           
=======================================
  Files           ?       15           
  Lines           ?      743           
  Branches        ?        0           
=======================================
  Hits            ?      475           
  Misses          ?      268           
  Partials        ?        0           

Flag	Coverage Δ
unit-tests	63.93% <0.00%> (?)

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