chore(releasing): Automated changelog generation #5

	# Changelog
	#
	# Validates that a changelog entry was added.
	# Runs on PRs when:
	# - opened/re-opened
	# - new commits pushed
	# - label is added or removed

	name: Changelog

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

	jobs:
	check-changelog:
	env:
	PR_HAS_LABEL: ${{ contains( github.event.pull_request.labels.*.name, 'no-changelog') }}
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3

	- name: Generate authentication token
	id: generate_token
	uses: tibdex/github-app-token@3beb63f4bd073e61482598c45c71c1019b59b73a
	with:
	app_id: ${{ secrets.GH_APP_DATADOG_VECTOR_CI_APP_ID }}
	private_key: ${{ secrets.GH_APP_DATADOG_VECTOR_CI_APP_PRIVATE_KEY }}

	- name: Get PR comment author
	id: author
	uses: tspascoal/get-user-teams-membership@v3
	with:
	username: ${{ github.actor }}
	team: 'Vector'
	GITHUB_TOKEN: ${{ steps.generate_token.outputs.token }}

	- env:
	EXTERN_CONTRIBUTOR: ${{ steps.author.outputs.isTeamMember }}
	run: \|
	if [[ $PR_HAS_LABEL == 'true' ]] ; then
	echo "'no-changelog' label detected."
	exit 0
	fi

	# helper script needs to reference the main branch to compare against
	git fetch origin master:refs/remotes/origin/master

	# If the PR author is an external contributor, validate that the
	# changelog fragments added contain the author line for website rendering.
	args=""
	if [[ $PR_HAS_LABEL == 'true' ]] ; then
	echo "PR author detected to be an external contributor."
	args="--author"
	fi

	./scripts/check_changelog_fragments.sh ${args}

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