Add more specialized interaction events #4751

	name: Fragments check

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

	jobs:
	check-fragment-added:
	if: github.event.pull_request.user.type != 'Bot' && !contains(github.event.pull_request.labels.*.name, 'skip-fragment-check')
	runs-on: ubuntu-latest

	steps:
	- name: Checkout repository
	uses: actions/checkout@v4
	with:
	# `towncrier check` runs `git diff --name-only origin/main...`, which
	# needs a non-shallow clone.
	fetch-depth: 0

	- name: Setup python
	uses: actions/setup-python@v5
	with:
	python-version: 3.9

	- name: Check if changelog fragment was added
	run: \|
	pip install -r dev-requirements/towncrier.txt

	if ! towncrier check --compare-with origin/${{ github.base_ref }}; then
	exit 1
	fi

	- name: Check if linked to the correct pull request
	run: \|
	diff=$(git diff origin/${{ github.base_ref }} HEAD --name-only)

	changelog_fragments=$(echo "$diff" \| grep "^changes/")
	valid_changelog_fragments=$(echo "$diff" \| grep "^changes/${{ github.event.number }}\.")

	if [ "$changelog_fragments" != "$valid_changelog_fragments" ]; then
	exit 1
	fi

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