feat: force delete branch caches on PR close #1

	name: Cleanup Caches

	# See:
	# https://docs.github.com/en/actions/writing-workflows/choosing-what-your-workflow-does/caching-dependencies-to-speed-up-workflows#force-deleting-cache-entries

	on:
	pull_request:
	types:
	- closed

	jobs:
	cleanup-branch-caches:
	runs-on: ubuntu-latest
	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/[email protected]

	- name: Cleanup Branch Caches
	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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