Use donfig for handling posttroll environment variables

[mraspaud]

This PR makes use of donfig to handle posttroll configuration

[pnuu]

We also have NAMESERVER_PORT and DEBUG environment variables. But I guess Donfig only handle variables that are prefixed?

[pnuu]

Oh, and otherwise LGTM

[pnuu]

It seems that the new environment variable handling isn't working for defining the min/max port range 🤔

[mraspaud]

Really? Test was passing locally...

[mraspaud]

We also have NAMESERVER_PORT and DEBUG environment variables. But I guess Donfig only handle variables that are prefixed?

Yes indeed. So that would need a longer process of deprecation.

[codecov]

Codecov Report

Merging #45 (db33805) into main (a2b6e69) will increase coverage by 0.58%.
The diff coverage is 95.45%.

@@            Coverage Diff             @@
##             main      #45      +/-   ##
==========================================
+ Coverage   78.66%   79.24%   +0.58%     
==========================================
  Files          14       14              
  Lines        2086     2101      +15     
==========================================
+ Hits         1641     1665      +24     
+ Misses        445      436       -9     

Impacted Files	Coverage Δ
posttroll/tests/test_pubsub.py	96.63% <94.73%> (+0.10%)	⬆️
posttroll/publisher.py	97.72% <100.00%> (+0.01%)	⬆️
posttroll/version.py	39.54% <0.00%> (+2.54%)	⬆️

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