Add changelog checker workflow #8

	# A CI configuration to check for licenses in Dart files.

	name: Changelog Check

	on:
	pull_request:
	branches: [ main ]
	types: [opened, synchronize, reopened, labeled, unlabeled]
	push:
	tags: [ '[A-z]+-v[0-9]+.[0-9]+.[0-9]+' ]

	jobs:
	changelog:
	# These permissions are required for authentication using OIDC and to enable
	# us to create comments on PRs.
	permissions:
	id-token: write
	pull-requests: write

	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab
	- uses: dart-lang/setup-dart@d6a63dab3335f427404425de0fbfed4686d93c4f
	with:
	sdk: stable

	- name: Install firehose
	run: dart pub global activate --source git https://github.com/dart-lang/ecosystem.git --git-path pkgs/firehose/ --git-ref=a07997d74ec315d6b6ac3684fdf8b67d82fcf717 #TODO remove, just for testing

	- name: Check package file licenses
	if: ${{ github.event_name == 'pull_request' }}
	env:
	GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
	ISSUE_NUMBER: ${{ github.event.number }}
	PR_LABELS: "${{ join(github.event.pull_request.labels.*.name) }}"
	run: dart pub global run firehose --changelog

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