Run coverage on pull requests

[havlli]

Summary: run the coverage workflow on pull requests and keep image publishing limited to successful main push coverage runs. Verification: workflow diff checked locally; GitHub Actions will validate the updated workflow.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.8%. Comparing base (7eb6559) to head (d082b01).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##              main     #18   +/-   ##
=======================================
  Coverage     98.8%   98.8%           
  Complexity     848     848           
=======================================
  Files          103     103           
  Lines         2201    2201           
  Branches        65      65           
=======================================
  Hits          2174    2174           
  Misses          27      27           

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