Repository cannot be loaded if both `strict_config(true)` and `$GIT_WORK_TREE` are set

[yuja]

Current behavior 😯

The following code errors out if GIT_WORK_TREE environment variable is set to e.g. the worktree directory path.

    let repo = gix::open::Options::default()
        .strict_config(true)
        .open(path)?;

Error: Failed to load the git configuration

Caused by:
    The key "core.worktree" (possibly from GIT_WORK_TREE) was invalid

Expected behavior 🤔

I'm not sure if the current behavior is expected, but I think a valid GIT_WORK_TREE should be either respected or ignored at all.

Git behavior

No response

Steps to reproduce 🕹

No response

---

Original issue:
jj-vcs/jj#6437

[Byron]

Thanks for reporting!

I already have a reproduction in a test and should have a fix soon.