chore: configure git globally for brew publish

[jsjoeio]

This should fix this issue we ran into with the 4.4.0 release.

https://github.com/coder/code-server/runs/6329089421?check_suite_focus=true#step:5:182

[github-actions]

✨ code-server docs for PR #5173 is ready! It will be updated on every commit.

• Host: https://coder.com/docs/code-server/4a794d0
• Last deploy status: success
• Commit: b0a141a
• Workflow status: https://github.com/coder/code-server/actions/runs/2284265403

[codecov]

Codecov Report

Merging #5173 (b0a141a) into main (6cf607e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #5173   +/-   ##
=======================================
  Coverage   71.73%   71.73%           
=======================================
  Files          30       30           
  Lines        1691     1691           
  Branches      375      375           
=======================================
  Hits         1213     1213           
  Misses        409      409           
  Partials       69       69           

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[github-actions]

✨ code-server dev build published to npm for PR #5173!

• Last publish status: success
• Commit: b0a141a

To install in a local project, run:

npm install @coder/code-server-pr@5173

To install globally, run:

npm install -g @coder/code-server-pr@5173