Add description template snippet for copy-pasting #101

	name: Add changelog.d snippet

	on:
	# This action should be run in workflows triggered by `pull_request_target`
	# (not by regular `pull_request`!)
	pull_request_target:
	# Run whenever the PR is pushed to, receives a label, or is created with
	# one or more labels:
	types: [synchronize, labeled]

	# Prevent the workflow from running multiple jobs at once when a PR is created
	# with multiple labels:
	concurrency:
	group: ${{ github.workflow }}-${{ github.ref_name }}
	cancel-in-progress: true

	jobs:
	add:
	runs-on: ubuntu-latest
	# Only run on PRs that have the "CHANGELOG-missing" label:
	if: contains(github.event.pull_request.labels.*.name, 'CHANGELOG-missing')
	steps:
	- name: Check out repository
	uses: actions/checkout@v3
	with:
	ref: ${{ github.event.pull_request.head.ref }}
	repository: ${{ github.event.pull_request.head.repo.full_name }}

	- name: Add changelog snippet
	uses: datalad/release-action/add-changelog-snippet@v1
	with:
	token: ${{ secrets.GITHUB_TOKEN }}
	rm-labels: CHANGELOG-missing

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