Feat: refactor config file

[dorianim]

Description

Rebuild the configuration file. It now uses /etc/linuxmuster-linuxclient7/config.yml. The old file /etc/linuxmuster-linuxclient7/config.conf is used as a fallback. On upgrade (linuxmuster-linuxclient7 upgrade), the legacy config file will be automatically converted to yaml and then deleted.

Fixes #32

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Unittests
• On a Debian 13 client

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[codecov]

Codecov Report

❌ Patch coverage is 90.76923% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 61.47%. Comparing base (092209f) to head (1378496).
⚠️ Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
...on3/dist-packages/linuxmusterLinuxclient7/setup.py	0.00%	4 Missing ⚠️
...n3/dist-packages/linuxmusterLinuxclient7/config.py	96.61%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #87      +/-   ##
==========================================
+ Coverage   56.73%   61.47%   +4.74%     
==========================================
  Files          18       18              
  Lines        1537     1529       -8     
==========================================
+ Hits          872      940      +68     
+ Misses        665      589      -76     

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