Ensure correct url is returned when running in github actions

[prgillies]

Description

In GitHub Actions, Git authentication configuration can rewrite GitHub remote URLs to include credentials. On a reused checkout, ecbundle’s multi-remote functionality obtains the rewritten URL via git remote and compares it literally with the unauthenticated URL from the bundle. It therefore treats the existing remote as different and fails while adding or updating remotes. This PR reads the remote URL directly from Git configuration, avoiding URL rewriting during comparison and allowing builds to be rerun using existing checkouts.

Contributor Declaration

By opening this pull request, I affirm the following:

• All authors agree to the Contributor License Agreement.
• The code follows the project's coding standards.
• I have performed self-review and added comments where needed.
• I have added or updated tests to verify that my changes are effective and functional.
• I have run all existing tests and confirmed they pass.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 66.66667% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 49.22%. Comparing base (de8a72c) to head (aff747e).

Files with missing lines	Patch %	Lines
ecbundle/git.py	66.66%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #50      +/-   ##
==========================================
+ Coverage   49.20%   49.22%   +0.01%     
==========================================
  Files          51       51              
  Lines       10385    10394       +9     
==========================================
+ Hits         5110     5116       +6     
- Misses       5275     5278       +3     

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[prgillies]

fyi @wdeconinck (not sure if you get notifications and can't add reviewers)

[wdeconinck]

That looks great @prgillies good change!