[WIP] CI: handle required workflows when skipped #691

	name: PostPR
	on:
	pull_request:
	types:
	- closed

	# This workflow does not have the permission to clean up cache for PRs
	# originated from a fork. The purpose here is to trigger a workflow_run
	# cleanup-cache-postpr.yml that has the right permission.

	jobs:
	noop:
	runs-on: ubuntu-latest
	steps:
	- name: No OP
	run: echo "This workflow is going to trigger CleanUpCachePostPR."

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