feat: `session status-history` handler #7712

	name: timeline-check

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

	jobs:
	pr-number-assign:
	if: ${{ !contains(github.event.pull_request.labels.*.name, 'skip:changelog') && github.event.pull_request.number != null }}
	uses: ./.github/workflows/pr-number-assign.yml
	secrets:
	WORKFLOW_PAT: ${{ secrets.WORKFLOW_PAT }}

	towncrier:
	needs: [pr-number-assign]
	runs-on: ubuntu-latest
	steps:
	- name: Get PR's fetch depth
	run: echo "PR_FETCH_DEPTH=$(( ${{ github.event.pull_request.commits }} + 1 ))" >> "${GITHUB_ENV}"
	- uses: actions/checkout@v4
	with:
	ref: ${{ github.event.pull_request.head.sha }}
	fetch-depth: ${{ env.PR_FETCH_DEPTH }}
	sparse-checkout: changes
	- name: Set up Python
	uses: actions/setup-python@v4
	with:
	python-version: "3.11"
	check-latest: true
	- name: Install dependencies
	run: \|
	python -m pip install -U pip setuptools
	python -m pip install -U towncrier~=22.12
	- name: Check existence of news fragment
	run: \|
	BASE_COMMIT=$(git rev-list --first-parent --max-parents=0 --max-count=1 HEAD)
	BASE_TIMESTAMP=$(git log --format=%ct "${BASE_COMMIT}")
	git fetch --no-tags --shallow-since "${BASE_TIMESTAMP}" origin "${BASE_REF}"
	python -m towncrier.check --compare-with=origin/${BASE_REF}
	env:
	BASE_REF: ${{ github.event.pull_request.base.ref }}
	PR_NUMBER: ${{ github.event.pull_request.number }}

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