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Bump actions/checkout from 3 to 4 #31657

	name: Check labels

	on:
	pull_request:
	types: [labeled, opened, synchronize, unlabeled]

	jobs:
	check-labels:
	runs-on: ubuntu-latest
	steps:
	- name: Pull image
	env:
	IMAGE: paritytech/ruled_labels:0.4.0
	run: docker pull $IMAGE

	- name: Check labels
	env:
	IMAGE: paritytech/ruled_labels:0.4.0
	MOUNT: /work
	GITHUB_PR: ${{ github.event.pull_request.number }}
	GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
	API_BASE: https://api.github.com/repos
	REPO: ${{ github.repository }}
	RULES_PATH: labels/ruled_labels
	CHECK_SPECS: specs_polkadot.yaml
	run: \|
	echo "REPO: ${REPO}"
	echo "GITHUB_PR: ${GITHUB_PR}"
	# Clone repo with labels specs
	git clone https://github.com/paritytech/labels
	# Fetch the labels for the PR under test
	labels=$( curl -H "Authorization: token ${GITHUB_TOKEN}" -s "$API_BASE/${REPO}/pulls/${GITHUB_PR}" \| jq '.labels \| .[] \| .name' \| tr "\n" ",")

	if [ -z "${labels}" ]; then
	docker run --rm -i -v $PWD/${RULES_PATH}/:$MOUNT $IMAGE check $MOUNT/$CHECK_SPECS --tags PR --no-label
	fi

	labels_args=${labels: :-1}
	printf "Checking labels: %s\n" "${labels_args}"

	# Prevent the shell from splitting labels with spaces
	IFS=","

	# --dev is more useful to debug mode to debug
	docker run --rm -i -v $PWD/${RULES_PATH}/:$MOUNT $IMAGE check $MOUNT/$CHECK_SPECS --labels ${labels_args} --dev --tags PR

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