Support additional apk feeds

[andibraeu]

this PR contains the following changes:

• allow to use apk repositories
• adds repositories to the default repositories instead of replacing them
• make network mode configurable, as pasta is sometime not available

[a-gave]

+1 for making the existing api 'repositories' able to both add extra repositories and replace existing ones, thanks from me!

[andibraeu]

I could add a flag or enum to the API to enable "replace" or "append" original repos

[andibraeu]

extended the api...

[andibraeu]

@aparcar fixed the tests and formatting issues

[codecov]

Codecov Report

❌ Patch coverage is 76.53631% with 42 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.55%. Comparing base (5e65dec) to head (cd1a73c).
⚠️ Report is 363 commits behind head on main.

Files with missing lines	Patch %	Lines
asu/build.py	10.00%	27 Missing ⚠️
asu/repositories.py	79.45%	15 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1590      +/-   ##
==========================================
+ Coverage   80.75%   90.55%   +9.80%     
==========================================
  Files          15       18       +3     
  Lines         977     1896     +919     
==========================================
+ Hits          789     1717     +928     
+ Misses        188      179       -9     

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[andibraeu]

obsolete due to #1602