CI: pytest setup fix

[mloubout]

Fixes pytest config issue, setup.cfg is ignored if pytest.ini exsists so our options were being ignored

[codecov]

Codecov Report

Merging #2177 (dcb8ea6) into master (6f75a9e) will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2177      +/-   ##
==========================================
+ Coverage   87.03%   87.09%   +0.06%     
==========================================
  Files         223      226       +3     
  Lines       39969    40136     +167     
  Branches     7302     7324      +22     
==========================================
+ Hits        34787    34957     +170     
  Misses       4600     4600              
+ Partials      582      579       -3     

Files Changed	Coverage Δ
examples/seismic/elastic/elastic_example.py	77.14% <100.00%> (+28.57%)	⬆️
...mples/seismic/viscoelastic/viscoelastic_example.py	77.14% <100.00%> (+28.57%)	⬆️
tests/test_mpi.py	99.09% <100.00%> (+0.22%)	⬆️

... and 12 files with indirect coverage changes