flake: fix very unfortunate Nix+Python developer inconvenience #173

	name: Commit Lint
	on:
	merge_group:
	pull_request:
	push:
	jobs:
	gitlint:
	name: Check commit messages
	runs-on: ubuntu-latest
	steps:
	- name: Checkout repository
	uses: actions/checkout@v6
	with:
	ref: ${{ github.event.pull_request.head.sha }}
	fetch-depth: 0
	- name: Set up Python
	uses: actions/setup-python@v6
	with:
	python-version: "3.10"
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install --upgrade gitlint
	- name: Lint git commit messages
	# GITHUB_BASE_REF not available in merge queue. It is sufficient to run
	# this check on the PR itself before the merge queue starts.
	if: github.event_name == 'pull_request'
	run: gitlint --commits origin/$GITHUB_BASE_REF..

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