Relative path include in .gitconfig throws AssertionError

[Virtlink]

My .gitconfig contains:

[include]
    path = .gitconfig_common

According to the Git documentation, this is allowed to be a relative path:

If the value of the variable is a relative path, the path is considered to be relative to the configuration file in which the include directive was found.

However, GitPython throws:

  File "/Users/daniel/.cache/uv/archive-v0/YvUvYFO1C0vkI8VZmPICW/lib/python3.12/site-packages/briefcase/commands/base.py", line 1365, in get_git_config_value
    if git_config.has_option(section, option):
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/daniel/.cache/uv/archive-v0/YvUvYFO1C0vkI8VZmPICW/lib/python3.12/site-packages/git/config.py", line 113, in assure_data_present
    self.read()
  File "/Users/daniel/.cache/uv/archive-v0/YvUvYFO1C0vkI8VZmPICW/lib/python3.12/site-packages/git/config.py", line 654, in read
    assert osp.isabs(file_path), "Need absolute paths to be sure our cycle checks will work"
           ^^^^^^^^^^^^^^^^^^^^
AssertionError: Need absolute paths to be sure our cycle checks will work

The workaround is to modify my .gitconfig and make the path absolute, but I'd like it to work without modifying my .gitconfig to suit GitPython.

[Byron]

Thanks for reporting, let's see if this can be fixed easily.