feat: cleanup caches for merged prs #3

	# Copied from https://github.com/actions/cache/blob/main/tips-and-workarounds.md#force-deletion-of-caches-overriding-default-cache-eviction-policy
	name: Cleanup Caches for Merged PRs

	on:
	pull_request:
	types: [closed]
	workflow_dispatch:
	inputs:
	pr_number:
	description: 'PR number to clean up caches for'
	required: true
	type: number

	jobs:
	cleanup:
	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/checkout@v4

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

	REPO="${{ github.repository }}"

	if [[ "${{ github.event_name }}" == "pull_request" ]]; then
	PR_NUMBER="${{ github.event.pull_request.number }}"
	else
	PR_NUMBER="${{ github.event.inputs.pr_number }}"
	fi

	BRANCH="refs/pull/$PR_NUMBER/merge"

	echo "Fetching list of cache keys for PR #$PR_NUMBER"
	cacheKeysForPR=$(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 "Cache cleanup completed"
	env:
	GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

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