Add merge_group support to builds workflow #1

	# https://github.com/actions/cache/blob/main/tips-and-workarounds.md#force-deletion-of-caches-overriding-default-cache-eviction-policy
	name: 🧹 Cache Cleanup
	on:
	pull_request:
	types:
	- closed

	jobs:
	cleanup:
	name: Cleanup PR caches
	runs-on: ubuntu-latest
	permissions:
	# `actions:write` permission is required to delete caches
	actions: write
	contents: read
	steps:
	- name: Cleanup
	env:
	GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
	GH_REPO: ${{ github.repository }}
	BRANCH: refs/pull/${{ github.event.pull_request.number }}/merge
	run: \|
	echo "Fetching list of cache key"
	cache_keys_for_pr=$(gh cache list --ref $BRANCH --limit 100 --json id --jq '.[].id')
	# Setting this to not fail the workflow while deleting cache keys.
	set +e
	echo "Deleting caches..."
	for cache_key in $cache_keys_for_pr; do
	gh cache delete $cache_key
	echo "Deleted: $cache_key"
	done
	echo "Done"

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