Introduce custom sync-downstream GHA, this can handle known conflicts #23

	---
	"name": "Docs (release notes)"
	"on":
	"push":
	"pull_request":
	"workflow_dispatch":

	permissions:
	contents: read

	env:
	poetry_version: '1.8.3'

	jobs:
	generate-releasenotes:
	name: Generate list of images for release notes
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4

	- name: Cache poetry in ~/.local
	uses: actions/cache/restore@v4
	id: cache-poetry-restore
	with:
	path: ~/.local
	key: "${{ runner.os }}-local-${{ env.poetry_version }}"

	- name: Install poetry
	if: steps.cache-poetry-restore.outputs.cache-hit != 'true'
	run: pipx install poetry==${{ env.poetry_version }}
	env:
	PIPX_HOME: /home/runner/.local/pipx
	PIPX_BIN_DIR: /home/runner/.local/bin

	- name: Check poetry is installed correctly
	run: poetry env info

	- name: Save cache
	if: steps.cache-poetry-restore.outputs.cache-hit != 'true'
	uses: actions/cache/save@v4
	with:
	path: ~/.local
	key: ${{ steps.cache-poetry-restore.outputs.cache-primary-key }}

	- name: Set up Python
	id: setup-python
	uses: actions/setup-python@v5
	with:
	python-version: '3.12'
	cache: 'poetry'

	- name: Configure poetry
	run: poetry env use "${{ steps.setup-python.outputs.python-path }}"

	- name: Install deps
	run: poetry install --sync

	- name: Run the release notes script
	run: \|
	set -Eeuxo pipefail
	poetry run ci/package_versions.py \| tee ${GITHUB_STEP_SUMMARY}

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