Merge back v0p5p3 #330

	# Reference:
	# - https://github.com/actions/checkout
	# - https://github.com/actions/setup-python
	# - https://github.com/snnaplab/get-labels-action
	# - https://github.com/dorny/paths-filter


	name: ci-changelog

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

	push:
	branches:
	- "!main"
	tags:
	- "!v*"

	workflow_dispatch:

	jobs:
	changelog:
	name: 'validate changelog'

	runs-on: ubuntu-latest

	defaults:
	run:
	shell: bash -l {0}

	if: github.actor != 'pre-commit-ci[bot]'
	steps:
	- uses: actions/checkout@v4
	with:
	fetch-depth: 0

	- uses: actions/setup-python@v5
	with:
	python-version: '3.x'

	- name: 'get PR labels'
	uses: snnaplab/get-labels-action@f426df40304808ace3b5282d4f036515f7609576

	- name: 'filter changelog'
	uses: dorny/paths-filter@de90cc6fb38fc0963ad72b210f1f284cd68cea36
	id: changes
	with:
	filters: \|
	changelog:
	- 'changelog/**'
	list-files: 'csv'

	- name: 'validate changelog'
	if: ${{ ! contains(fromJSON(env.LABELS), 'skip changelog') }}
	env:
	CHANGELOG: "${{ steps.changes.outputs.changelog_files }}"
	PR: "${{ github.event.number }}"
	SCRIPTS: "./.github/scripts"
	run: \|
	python -m pip install click towncrier
	python -c "import sys; print(f'version = {sys.version}')"
	towncrier --version
	python ${SCRIPTS}/changelog.py "${PR}" "${CHANGELOG}"

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