agentgateway: report nacks via events #956

	# This workflow blocks PRs from merging if they have certain labels.
	name: Pre-merge label checker
	on:
	pull_request:
	types: [opened, edited, reopened, synchronize, labeled, unlabeled]
	merge_group:
	types: [checks_requested]

	jobs:
	check-labels:
	runs-on: ubuntu-latest
	steps:
	# only run this step on PRs, not in the merge queue (we need to explicitly add the merge queue logic because making this check required
	# causes it to get run in the merge queue as well)
	- name: Conditional skip for merge queue
	if: github.event_name == 'merge_group'
	run: \|
	echo "Skipping check in merge queue"
	exit 0

	- name: Check for labels that should block merge
	if: github.event_name != 'merge_group'
	env:
	PR_LABELS: ${{ toJson(github.event.pull_request.labels) }}
	run: \|
	echo "$PR_LABELS" \| jq -r '.[].name' \| while read -r label; do
	if [[ "$label" == "do-not-merge"* \|\| "$label" == "work in progress" ]]; then
	echo "Pull request has 'do-not-merge' or 'work in progress' label. Blocking merge."
	exit 1
	fi
	done

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