pkg: replace installer git dir

[MikeMcQuaid]

• replace the staged .git atomically before privileged Git runs
• avoid merging into an existing .git during Intel reinstalls
• keep a clean packaged Git directory in .git.pkg

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[Copilot]

Pull request overview

This PR adjusts the macOS installer packaging flow to keep a pristine packaged Git directory in .git.pkg and then replace the installed .git directory via renames before running privileged Git commands, including during Intel /usr/local reinstalls.

Changes:

• Add cleanup of ${homebrew_directory}/.git.pkg in preinstall.
• Replace .git using .git.pkg (with a .git.previous staging dir) in postinstall, and switch Intel /usr/local/Homebrew handling from copy to rename-based replacement.
• Update the release workflow to include a .git.pkg directory in the pkg payload by copying brew/.git.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
package/scripts/preinstall	Removes any existing .git.pkg before payload install to avoid directory merges.
package/scripts/postinstall	Replaces .git from .git.pkg and updates Intel reinstall behavior to avoid merging into an existing .git.
.github/workflows/release.yml	Adds creation of brew/.git.pkg during release packaging.

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[Bo98]

this will reset analytics settings etc so might want to restore those