Add note on spack recipes #13

	name: Doc Preview Cleanup

	on:
	pull_request:
	types: [closed]

	concurrency:
	# Same group concurrency as the `docs.yml` workflow, because they both
	# git-push to the same branch, so we want to avoid clashes.
	group: docs-pushing

	jobs:
	doc-preview-cleanup:
	timeout-minutes: 10
	runs-on: ubuntu-latest
	steps:
	- name: Checkout gh-pages branch
	uses: actions/checkout@v4
	with:
	ref: gh-pages
	- name: Delete preview and push changes
	run: \|
	git config user.name "${{github.actor}}"
	git config user.email "${{github.actor_id}}+${{github.actor}}@users.noreply.github.com"
	git rm -rf preview/PR${{ github.event.number }}
	git commit -m 'Cleanup docs for PR #${{ github.event.number }}'
	git push origin gh-pages

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