Cache Cleanup #1452

	name: Cache Cleanup

	# Prune superseded rust-cache generations right after new caches are saved.
	# Caches are only saved on master (`save-if: master`), so this runs whenever
	# the cache-producing workflows finish on master. Keeping only the newest
	# generation per logical key bounds the repo cache at ~1 generation/key,
	# regardless of how often dependabot churns Cargo.lock.
	on:
	workflow_run:
	workflows: ["Regression", "CodSpeed"]
	types: [completed]

	permissions:
	actions: write

	jobs:
	prune:
	if: github.event.workflow_run.head_branch == 'master'
	runs-on: ubuntu-latest
	steps:
	- name: Delete superseded cache generations
	env:
	GH_TOKEN: ${{ github.token }}
	REPO: ${{ github.repository }}
	run: \|
	# Group caches by their logical key, keep the newest by created_at in
	# each group, and delete the rest. rust-cache keys end in
	# `-<rustc-hash>-<lockfile-hash>`; sccache keys end in a single
	# `-<commit-sha>` segment.
	gh api --paginate "repos/$REPO/actions/caches" \
	--jq '.actions_caches[] \| [.key, .created_at, (.id\|tostring)] \| @tsv' \
	\| awk -F'\t' '{ g=$1; if (g ~ /^sccache-/) sub(/-[0-9a-f]+$/,"",g); else sub(/-[0-9a-f]+-[0-9a-f]+$/,"",g); print g"\t"$2"\t"$3 }' \
	\| sort -t"$(printf '\t')" -k1,1 -k2,2r \
	\| awk -F'\t' '{ if ($1==p) print $3; p=$1 }' \
	\| while read -r id; do
	echo "delete cache $id"
	gh api -X DELETE "repos/$REPO/actions/caches/$id" \|\| echo "failed to delete $id"
	done

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