GitHub Actions: Add CODECOV_TOKEN

[tangrufus]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.00%. Comparing base (76f3f01) to head (35c8012).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##               main   #27       +/-   ##
==========================================
- Coverage     61.79%     0   -61.80%     
==========================================
  Files            10     0       -10     
  Lines           178     0      -178     
==========================================
- Hits            110     0      -110     
+ Misses           68     0       -68     

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