On Merge Queue Branch Delete #1382

	# This workflow handles cleanup after a branch is deleted.
	# For MergeQueue (MQ) branches, we want to cancel redundant builds when an MQ PR is removed or reshuffled in the queue.
	# NOTE: This workflow runs only from the main branch; it's safe to remove from LTS branches after deployment.
	name: On Merge Queue Branch Delete

	on: delete

	jobs:
	handle-delete:
	# The delete event can be triggered for either a tag or a branch.
	# We only care about branch deletions.
	# Reference: https://docs.github.com/en/rest/using-the-rest-api/github-event-types?apiVersion=2022-11-28#deleteevent
	if: github.event.ref_type == 'branch'
	runs-on: ubuntu-latest

	steps:
	- name: Checkout current repository
	uses: actions/checkout@v4

	- name: Cancel GH workflows
	# This action cancels any running builds for MQ branches which have already been deleted.
	# NOTE: GitHub Actions doesn't currently support filtering by branch pattern
	# on delete events, so this action handles filtering out non-MQ branches internally.
	# Related discussion: https://github.com/orgs/community/discussions/10589
	uses: ./.github/actions/mq-cancel-dangling-wfs
	with:
	GH_ORG_REPO: ${{ github.repository }}
	# Best practice: Pass secrets via env vars, not as inputs
	env:
	GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

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