Update README with thanks section #7

	name: preview-cleanup

	# Uses pull_request_target so fork PR closes also have write access to the
	# base repo (the GITHUB_TOKEN for the plain `pull_request` event is read-only
	# on fork PRs regardless of declared permissions). Safe here because we never
	# check out or run PR code -- the job only deletes a ref by a number derived
	# from the trusted event payload.
	on:
	pull_request_target:
	types: [closed]
	branches:
	- main

	permissions:
	contents: write

	jobs:
	cleanup:
	name: Delete preview branch
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4

	- name: Delete preview branch
	env:
	PR_NUMBER: ${{ github.event.pull_request.number }}
	run: \|
	set -euo pipefail
	branch="preview/pr-${PR_NUMBER}"
	if git ls-remote --exit-code --heads origin "$branch" >/dev/null 2>&1; then
	git push origin --delete "$branch"
	echo "Deleted $branch"
	else
	echo "No preview branch to delete ($branch)"
	fi

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