ci: use make coverage

[fmorency]

Use make coverage and upload filtered results to codecov.

Image caching and optimization can be part of future work.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (main@ef4fc76). Click here to learn what that means.

❗ Current head 81734fb differs from pull request most recent head 67a77ad. Consider uploading reports for the commit 67a77ad to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #28   +/-   ##
=======================================
  Coverage        ?   42.80%           
=======================================
  Files           ?       34           
  Lines           ?     2196           
  Branches        ?        0           
=======================================
  Hits            ?      940           
  Misses          ?     1212           
  Partials        ?       44           

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