Cache GC #35

	# Garbage collection for the hestia Nix binary cache.
	#
	# Hestia stores build results in the GitHub Actions cache. PR-scoped caches
	# disappear with their branch, but the default-branch scope grows forever
	# unless something prunes it, so GC has to run on the default branch.
	# See action/README.md in https://github.com/Mic92/hestia.
	name: Cache GC
	on:
	schedule:
	# Daily, off-peak (UTC).
	- cron: "23 3 * * *"
	# Manual runs for debugging and one-off cleanups.
	workflow_dispatch:
	inputs:
	dry-run:
	description: Plan only; do not repack, touch, or delete anything.
	type: boolean
	default: false
	permissions:
	contents: read
	jobs:
	gc:
	runs-on: ubuntu-latest
	permissions:
	# REST cache deletes and GHA cache access both need actions:write.
	actions: write
	contents: read
	steps:
	- name: Install Nix
	uses: cachix/install-nix-action@v20
	- name: Setup hestia
	uses: Mic92/hestia@v1
	- name: Run garbage collection
	run: \|
	"$HESTIA_BIN" gc ${{ inputs.dry-run && '--dry-run' \|\| '' }}
	env:
	GITHUB_TOKEN: ${{ github.token }}

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