cache-prune #159

	name: cache-prune

	# Keeps the repository's total cache size below a fixed limit, so that GitHub never
	# rejects a save for being over the allowance.

	on:
	schedule:
	- cron: "37 /6 * *" # every six hours at :37
	workflow_dispatch:
	workflow_call:

	permissions: {}

	concurrency:
	group: cache-prune

	jobs:
	prune:
	runs-on: ubuntu-latest
	if: github.repository == 'go-gitea/gitea'
	permissions:
	actions: write # to delete caches
	env:
	GH_TOKEN: ${{ github.token }}
	GH_REPO: ${{ github.repository }}
	steps:
	# Keep the newest generation per key, restores never reach the older ones.
	- name: delete superseded caches
	run: \|
	gh cache list --limit 1000 --json id,key,ref,createdAt \|
	jq -r 'group_by([.ref, (.key \| sub("(-go[0-9.]+)?-[0-9a-f]{40,64}(-[0-9]+-[0-9]+)?$"; ""))])[]
	\| sort_by(.createdAt)[:-1][] \| "\(.id) \(.key)"' \|
	while read -r id key; do
	echo "deleting $key"
	gh cache delete "$id" \|\| true
	done

	# Deletes least recently used first, the order GitHub itself evicts in.
	- name: delete caches over the size limit
	run: \|
	caches=$(gh cache list --limit 1000 --sort last_accessed_at --order asc --json id,key,sizeInBytes)
	size=$(jq '[.[].sizeInBytes] \| add // 0' <<< "$caches")
	echo "cache usage: $((size / 1000000)) MB"
	while [ "$size" -gt 6000000000 ] && read -r id bytes key; do
	echo "deleting $key"
	gh cache delete "$id" \|\| true
	size=$((size - bytes))
	done <<< "$(jq -r '.[] \| "\(.id) \(.sizeInBytes) \(.key)"' <<< "$caches")"

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