PR 132 #113

	# SPDX-License-Identifier: MIT
	# Copyright (c) 2023. University of Texas at Austin. All rights reserved.

	# https://github.com/actions/cache/blob/v3/tips-and-workarounds.md#force-deletion-of-caches-overriding-default-cache-eviction-policy
	name: Cleanup cache upon closing PR
	run-name: PR ${{ github.event.pull_request.number }}
	on:
	pull_request:
	types:
	- closed
	workflow_dispatch:

	jobs:
	cleanup:
	runs-on: ubuntu-22.04
	permissions:
	# `actions:write` permission is required to delete caches
	# See also: https://docs.github.com/en/rest/actions/cache?apiVersion=2022-11-28#delete-a-github-actions-cache-for-a-repository-using-a-cache-id
	actions: write
	contents: read
	steps:
	- name: Check out code
	uses: actions/checkout@v3

	- name: Cleanup
	run: \|
	gh extension install actions/gh-actions-cache

	REPO=${{ github.repository }}
	BRANCH=refs/pull/${{ github.event.pull_request.number }}/merge

	echo "Fetching list of cache key"
	cacheKeysForPR=$(gh actions-cache list -R $REPO -B $BRANCH \| cut -f 1 )

	## Setting this to not fail the workflow while deleting cache keys.
	set +e
	echo "Deleting caches..."
	for cacheKey in $cacheKeysForPR
	do
	gh actions-cache delete $cacheKey -R $REPO -B $BRANCH --confirm
	done
	echo "Done"
	env:
	GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

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