Copy pre-commit hook to real GIT_DIR

[djpohly]

📚 Description

The Git repository is not always ".git" - for example, if this repository is a submodule or worktree, or if $GIT_DIR is set explicitly.

🔖 Changes

• Updates the Makefile to use git rev-parse --git-dir to find the real directory.

✅ To-do list

• [ ] I updated the CHANGELOG.md to reflect the new feature or fix
• [ ] I updated the documentation to reflect the changes

(This didn't seem like a big enough change to merit either of these.)

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Watermelon AI Summary

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GitHub PRs

• #238 - Copy pre-commit hook to real GIT_DIR - By djpohly 9 minutes ago

• #230 - docs: Remove Git submodule - By Chemaclass 4 weeks ago

• #232 - Fix test doubles - By antonio-gg-dev 3 weeks ago

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