Cleanup learning #42

	name: Doc Preview Cleanup

	on:
	pull_request:
	types: [closed]

	concurrency:
	# Same group concurrency as the `deploy.yml` workflow, because they both
	# git-push to the `gh-preview` branch, so we want to avoid clashes.
	group: global-lock-ghpreview-pushing

	jobs:
	doc-preview-cleanup:
	runs-on: ubuntu-latest
	if: github.event.pull_request.merged == true # don't do this if PR is closed/reopened, b/c this is common way of re-triggering CI
	permissions:
	contents: write # Needed to be able to push to `gh-preview` branch
	steps:
	- name: Checkout gh-preview branch
	uses: actions/checkout@v5
	with:
	ref: gh-preview
	- name: Delete preview and history + push changes
	run: \|
	preview_directory=previews/PR${{ github.event.number }}
	if [[ -d "${preview_directory}" ]]; then
	git config user.name "${{github.actor}}"
	git config user.email "${{github.actor_id}}+${{github.actor}}@users.noreply.github.com"
	git rm -rf "${preview_directory}"
	git commit -m 'Cleanup docs for PR #${{ github.event.number }}'
	git branch gh-preview-new $(echo "Delete history" \| git commit-tree HEAD^{tree})
	git push --force origin gh-preview-new:gh-preview
	fi

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