Bump cachix/install-nix-action from V27 to 28 #6111

	name: commit-validation
	on: [ push ]

	permissions:
	contents: read

	jobs:
	check-commit-msg-length:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- name: Check commit message length
	id: check-commit-msg-length
	uses: actions/github-script@v7
	with:
	result-encoding: json
	script: \|
	var longlines = 0;
	const commits = ${{ toJSON(github.event.commits) }};
	for (const commit of commits) {
	for (const line of commit.message.split('\n')) {
	if (line.length > 78) {
	longlines += 1;
	console.log("Overlong line:\n" + line);
	}
	}
	}
	return longlines
	- name: Get result
	run: \|
	result=${{steps.check-commit-msg-length.outputs.result}}
	if [[ $result -eq 0 ]]; then
	echo "Ok"
	exit 0
	else
	echo "Commit messages contain $result lines longer than 78 characters."
	echo "See under 'Check commit message length' for a list of the lines."
	exit 1
	fi

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