DEV: Test with macOS as well

[stefan6419846]

Closes #3399.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.94%. Comparing base (2a91bd4) to head (40577cf).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3401   +/-   ##
=======================================
  Coverage   96.94%   96.94%           
=======================================
  Files          55       55           
  Lines        9333     9333           
  Branches     1708     1708           
=======================================
  Hits         9048     9048           
  Misses        170      170           
  Partials      115      115           

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[stefan6419846]

It seems like jbig2dec is not working as expected on macOS due to building without libpng: https://github.com/Homebrew/homebrew-core/blob/main/Formula/j/jbig2dec.rb#L37

I am not sure if we can reliably detect this without too much overhead, as fully switching from PNG to PBM increases the temporary size for an example image by more than factor 5 (factor 5.4093 for http://cgit.ghostscript.com/cgi-bin/cgit.cgi/tests.git/tree/jbig2/042_1.jb2)

I will not remove installing jbig2dec for now to discuss on how to continue with this before merging.