beman-tidy does not work with git worktrees

[steve-downey]

When using git worktrees a standard tool for working with multiple checked out branches at once, beman-tidy fails with

sdowney@pwyll:~/src/infra/tools/beman-tidy/beman_tidy (main ♥)
$ uv run beman-tidy ~/src/bemanproject/exemplar/exemplar.git --require-all --verbose
An error occurred while getting repository information. Check /home/sdowney/src/bemanproject/exemplar/exemplar.git.

or

sdowney@pwyll:~/src/infra/tools/beman-tidy/beman_tidy (main ♥)
$ uv run beman-tidy ~/src/bemanproject/exemplar/main --require-all --verbose
An error occurred while getting repository information. Check /home/sdowney/src/bemanproject/exemplar/main.

when pointing at either the bare main repository or the worktree.

This might be a limitation in the GitPython module.