Add Fedora 43 to CI pipeline

[hummeltech]

Also some Docker updates to simplify testing with an actual dataset and mapnik.xml file.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.95%. Comparing base (c4e3e62) to head (c3a541b).
⚠️ Report is 26 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #493      +/-   ##
==========================================
- Coverage   81.54%   80.95%   -0.59%     
==========================================
  Files          24       24              
  Lines        5645     5234     -411     
==========================================
- Hits         4603     4237     -366     
+ Misses       1042      997      -45     

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