Benchmark julia-actions/cache for CI runtime #17

	name: Documentation Preview Cleanup

	on:
	pull_request:
	types: [closed]

	jobs:
	doc-preview-cleanup:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout gh-pages branch
	uses: actions/checkout@v6
	with:
	ref: gh-pages

	- name: Delete preview and history
	id: cleanup
	run: \|
	git config user.name "Documenter.jl"
	git config user.email "documenter@juliadocs.github.io"
	git rm -rf --ignore-unmatch "previews/PR$PRNUM"
	if git diff --cached --quiet; then
	echo "No preview found for PR$PRNUM"
	echo "changed=false" >> "$GITHUB_OUTPUT"
	exit 0
	fi
	git commit -m "delete preview"
	git branch gh-pages-new $(echo "delete history" \| git commit-tree HEAD^{tree})
	echo "changed=true" >> "$GITHUB_OUTPUT"
	env:
	PRNUM: ${{ github.event.number }}

	- name: Push changes
	if: steps.cleanup.outputs.changed == 'true'
	run: \|
	git push --force origin gh-pages-new:gh-pages

	# Workflow copied from https://github.com/CliMA/TimeMachine.jl

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