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Update README.md #2143

	# This workflow checks that there is either a 'pr/no-changelog' label applied to a PR
	# or there is a .changelog/<pr_number>.txt file containing a changelog entry with
	# one or more valid changelog notes
	name: changelog
	on:
	pull_request:
	types: [opened, synchronize, labeled]
	# Runs on PRs to main and all release branches
	branches:
	- main
	- release/*

	jobs:
	validate:
	# If there a `pr/no-changelog` label we ignore this check
	if: "!contains(github.event.pull_request.labels.*.name, 'pr/no-changelog')"
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab # v3.5.2
	with:
	ref: ${{ github.event.pull_request.head.sha }}
	fetch-depth: 0 # by default the checkout action doesn't checkout all branches
	- uses: ./.github/actions/goenv
	with:
	go-version: '1.19'
	- name: Check for changelog entry in diff
	run: \|
	pull_request_base_main=$(expr "${{ github.event.pull_request.base.ref }}" = "main")

	# For PRs against the main branch, the changelog file name should match
	# the PR number
	if [ pull_request_base_main ]; then
	enforce_matching=1
	changelog_file_path=".changelog/${{ github.event.pull_request.number }}.txt"
	else
	changelog_file_path=".changelog/*(_)+([[:digit:]]).txt"
	fi

	# Fail status check if non-zero exit code is returned
	./scripts/changelog-check.sh ${changelog_file_path} ${enforce_matching}

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