Fix the integration with Coveralls

[adybbroe]

Fix the integration with Coveralls - it was lost when moving from Travis-CI to Github Actions

• [ ] Closes #xxxx
• [ ] Tests added
• [ ] Tests passed: Passes pytest nwcsafpps_runner
• [ ] Passes flake8 nwcsafpps_runner
• [ ] Fully documented

[codecov[bot]]

Codecov Report

Merging #26 (78b57b9) into main (2526dd0) will increase coverage by 2.18%. The diff coverage is 60.55%.

@@            Coverage Diff             @@
##             main      #26      +/-   ##
==========================================
+ Coverage   29.82%   32.01%   +2.18%     
==========================================
  Files          12       11       -1     
  Lines        1747     1690      -57     
  Branches        0      221     +221     
==========================================
+ Hits          521      541      +20     
+ Misses       1226     1143      -83     
- Partials        0        6       +6     

Flag	Coverage Δ
unittests	32.01% <60.55%> (+2.18%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
nwcsafpps_runner/metno_update_nwp.py	0.00% <0.00%> (ø)
nwcsafpps_runner/pps2018_runner.py	0.00% <0.00%> (ø)
nwcsafpps_runner/pps_runner.py	0.00% <0.00%> (ø)
nwcsafpps_runner/prepare_nwp.py	0.00% <0.00%> (ø)
nwcsafpps_runner/utils.py	26.38% <50.00%> (-0.46%)	:arrow_down:
nwcsafpps_runner/pps_posttroll_hook.py	77.71% <94.44%> (-1.44%)	:arrow_down:
nwcsafpps_runner/tests/test_pps_hook.py	100.00% <100.00%> (ø)
... and 5 more

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[adybbroe]

Ok to merge @mraspaud ?