ci: tweak ci.yml

[thofma]

After clogging the CI queue with many small commits in #400, I noticed that intermediate builds for pull requests are not cancelled. This fixes it.

@Krastanov If you want this, I can also add it to the other *.yml files.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.03%. Comparing base (66c0584) to head (f2e9233).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #401      +/-   ##
==========================================
- Coverage   83.08%   83.03%   -0.05%     
==========================================
  Files          70       70              
  Lines        4410     4410              
==========================================
- Hits         3664     3662       -2     
- Misses        746      748       +2     

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[Krastanov]

Thank you! This is very much appreciated, I did not know it exists as a feature. And if you have the bandwidth, I would certainly take you up on the offer to add it to the other workflows.

[Krastanov]

@Fe-r-oz , thanks to this change, you can now disregard my request to batch multiple small commits in a single large push.