Optimize Go's mod cache usage across GH Actions #1

	name: Cleanup closed PRs
	on:
	pull_request:
	types:
	- closed

	jobs:
	# Based on https://github.com/actions/cache/blob/v4.2.0/tips-and-workarounds.md#force-deletion-of-caches-overriding-default-cache-eviction-policy
	actions-caches:
	name: Delete GitHub Action 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: Cleanup
	env:
	GH_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
	GH_REPO: "${{ github.repository }}"
	BRANCH: "refs/pull/${{ github.event.pull_request.number }}/merge"
	run: \|
	set -euo pipefail
	gh api -X GET /repos/{owner}/{repo}/actions/caches -f ref="$BRANCH" --paginate -q '.actions_caches[] \| "\(.id) \(.key)"' \| {
	fail=0
	while read -r id key; do
	echo Deleting cache with ID $id: $key
	gh api -X DELETE /repos/{owner}/{repo}/actions/caches/"$id" \|\| fail=1
	done
	[ $fail -eq 0 ]
	}

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