ci: add codecov.yml configuration file

[tbjers]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.59%. Comparing base (3d6c0aa) to head (40c6015).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main       #7   +/-   ##
=======================================
  Coverage   99.59%   99.59%           
=======================================
  Files           6        6           
  Lines         244      244           
  Branches       53       53           
=======================================
  Hits          243      243           
  Partials        1        1           

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