build(uv-cli): Set correct gitdir and head path for worktree

[eth3lbert]

Summary

Resolves #6196 .

Test Plan

Run cargo check multiple times within the worktree and inspect the outputs. There should be no Compiling message after the first check.

[eth3lbert]

Some related info:

:)  tree /Users/eth/workspace/astral-sh -L 1
/Users/eth/workspace/astral-sh/
├── uv/
└── uv-dev/

(devshell) :)  git worktree list
/Users/eth/workspace/astral-sh/uv      20ef94b15 [main]
/Users/eth/workspace/astral-sh/uv-dev  3c313126b [uv-cli-worktree]

content of .git file in worktree:

(devshell) :)  /bin/cat /Users/eth/workspace/astral-sh/uv-dev/.git
gitdir: /Users/eth/workspace/astral-sh/uv/.git/worktrees/uv-dev

content of HEAD of worktree:

(devshell) :)  /bin/cat /Users/eth/workspace/astral-sh/uv/.git/worktrees/uv-dev/HEAD
ref: refs/heads/uv-cli-worktree

content of commondir of worktree:

(devshell) :)  /bin/cat /Users/eth/workspace/astral-sh/uv/.git/worktrees/uv-dev/commondir 
../..

[zanieb]

cc @charliermarsh can you actually review this since you use worktrees?

[charliermarsh]

Sure, no prob.

[BurntSushi]

@eth3lbert I just merged #6825. I ended up submitting that before realizing this PR or #6196 existed. I merged that one over this one because I liked having the logic split out into a separate function. But this overall looked good too. Apologies for the duplicated effort and thank you for noticing this problem and submitting a fix. :-)

[eth3lbert]

@eth3lbert I just merged #6825. I ended up submitting that before realizing this PR or #6196 existed. I merged that one over this one because I liked having the logic split out into a separate function. But this overall looked good too. Apologies for the duplicated effort and thank you for noticing this problem and submitting a fix. :-)

All good, thanks!