feat: support setting default bot per repo

[mtth]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 76.92308% with 3 lines in your changes missing coverage. Please review.

Project coverage is 90.22%. Comparing base (75b1703) to head (2f820c8).

Files with missing lines	Patch %	Lines
src/git_draft/git.py	66.66%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #68      +/-   ##
==========================================
+ Coverage   90.02%   90.22%   +0.19%     
==========================================
  Files          10       10              
  Lines         702      706       +4     
  Branches       55       55              
==========================================
+ Hits          632      637       +5     
+ Misses         49       48       -1     
  Partials       21       21              

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