Use publisher config.

[gerritholl]

Add an option to use a publisher configuration file.

Needs posttroll 1.7.

• Closes Make publisher configurable #13.
• Added unit tests
• Added documentation

[codecov]

Codecov Report

Merging #14 (2cfa513) into main (da40178) will increase coverage by 0.31%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #14      +/-   ##
==========================================
+ Coverage   78.13%   78.45%   +0.31%     
==========================================
  Files          12       12              
  Lines         956      970      +14     
==========================================
+ Hits          747      761      +14     
  Misses        209      209              

Flag	Coverage Δ
unittests	78.45% <100.00%> (+0.31%)	⬆️

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

Impacted Files	Coverage Δ
cspp_runner/runner.py	85.36% <100.00%> (+0.20%)	⬆️
cspp_runner/tests/test_runner.py	98.93% <100.00%> (+0.02%)	⬆️
cspp_runner/tests/test_viirs_dr_runner.py	100.00% <100.00%> (ø)
cspp_runner/viirs_dr_runner.py	96.66% <100.00%> (+0.05%)	⬆️

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[mraspaud]

LGTM!

Thank you for this feature. The way we usually to things in pytroll runners/collectors is to have one config file for the whole process, but this seems like a more flexible way to provide configuration to each component, eg the publisher config can be used across multiple process.