Bump actions/checkout from 3 to 4 #21

	name: Ensure readme.md is up to date

	on:
	pull_request:
	branches:
	- master
	push:
	branches:
	- master

	jobs:
	ensure_readme_up_to_date:
	name: Ensure readme.md is up to date
	if: "contains(github.event.commits[0].message, '[ci skip]') == false"
	runs-on: ubuntu-latest
	permissions:
	# Give the default GITHUB_TOKEN write permission to commit and push the
	# added or changed files to the repository.
	contents: write
	steps:
	- name: Checkout
	uses: actions/checkout@v4
	- name: Setup Ruby
	uses: ruby/setup-ruby@v1
	with:
	ruby-version: 3.1
	bundler-cache: true
	- name: generate readme
	run: script/generate_readme
	- name: Commit updated README.md
	uses: stefanzweifel/git-auto-commit-action@v4
	with:
	file_pattern: 'README.md'
	- name: check that new readme is identical to the old
	run: \|
	if [ -z "$(git status --porcelain README.md)" ]
	then
	echo "✅ README.md is up to date!"
	else
	echo "❌ README.md is out of date. Please run script/generate_readme and commit the results."
	git diff
	git status --porcelain
	exit 1
	fi

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