CleanUpCachePostPR #1884

	name: CleanUpCachePostPR

	on:
	workflow_run:
	workflows: [PostPR]
	types:
	- completed

	permissions:
	contents: read

	jobs:
	CleanUpCcacheCachePostPR:
	name: Clean Up Ccache Cache Post PR
	runs-on: ubuntu-latest
	permissions:
	actions: write
	contents: read
	env:
	GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
	steps:
	- uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
	- name: Clean up ccache
	run: \|
	REPO=${{ github.repository }}

	# For debugging cat ${GITHUB_EVENT_PATH} to see the payload.

	pr_head_sha=${{ github.event.workflow_run.head_sha }}
	pr_number=$(gh pr list --state all --search $pr_head_sha --json number --jq '.[0].number')
	echo "Post-PR cache cleanup for PR ${pr_number}"
	BRANCH=refs/pull/${pr_number}/merge

	# Setting this to not fail the workflow while deleting cache keys.
	set +e

	# Note that `gh cache delete` has no ref filter, so we delete by
	# cache id, not by key.
	ids=$(gh cache list -L 100 -R $REPO --ref $BRANCH --json id --jq '.[].id')
	for i in $ids
	do
	# `\|\| true` so that a failed deletion does not fail the step: the
	# step's exit status is that of the last command run.
	gh cache delete "$i" -R $REPO \|\| true
	done

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