[s] Mergequeue map test 2 #5

	name: Merge Queue Tests
	on:
	merge_group:
	push:
	pull_request:

	jobs:
	verify_merge:
	name: Verify map merge sanity
	runs-on: ubuntu-latest
	# Below if lets it run as a required check but skip on normal push/PR events
	if: ${{ github.event_name == 'merge_group'}}
	env:
	GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
	steps:
	- name: Checkout code
	uses: actions/checkout@v4
	with:
	# allegedly this is as deep as necessary to always receive the base ref
	fetch-depth: 2

	- name: Verify map merge
	run: \|
	# assume we're at the head ref and give it a name we know
	git switch -c gh/mergequeue/head
	# go back to the base ref and attempt our own merge
	git checkout ${{ github.event.merge_group.base_sha }}
	git switch -c gh/mergequeue/base
	git merge gh/mergequeue/head

	# the merge was not concluded cleanly
	if [ -e ".git/MERGE_HEAD" ]; then
	echo "Merge state detected; manual resolution most likely required"
	exit 1
	fi

	# if our merge was clean but our's and GitHubs differ, then complain
	if [[ `git diff --exit-code gh/mergequeue/head` ]]; then
	echo "Queue merge does not match driver merge; manual resolution most likely required"
	exit 1
	fi

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