Update CI build action to work without setup.py

[pnuu]

In #169 the setup.py was removed, but the CI action to build and deploy the released package was updated. This PR adapts the action to use python -m build command.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.84%. Comparing base (6fb6efd) to head (c4d523a).
Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #172      +/-   ##
==========================================
+ Coverage   87.81%   87.84%   +0.02%     
==========================================
  Files          16       16              
  Lines        2626     2632       +6     
==========================================
+ Hits         2306     2312       +6     
  Misses        320      320              

Flag	Coverage Δ
unittests	87.84% <ø> (+0.02%)	⬆️

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[mraspaud]

Thanks for the fix, LGTM!

[coveralls]

coverage: 87.807%. remained the same
when pulling c4d523a on pnuu:ci-update-build
into d582531 on pytroll:main.