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Cache depends sources #311

	name: Cache depends sources

	on:
	workflow_call:
	inputs:
	runs-on:
	description: "Runner label to use"
	required: false
	type: string
	default: ubuntu-24.04-arm
	schedule:
	# Run daily at 6 AM UTC on the default branch to keep cache warm
	- cron: '0 6 * * *'

	jobs:
	cache-sources:
	name: Cache depends sources
	# Intentionally keep scheduled cache warming on GitHub-hosted ARM runners.
	# Blacksmith caches are expected to persist long enough without a warmup cron.
	# build.yml passes its pre-lint runner, which may be self-hosted; the cache
	# key does not name the runner, so any arch can fill it.
	runs-on: ${{ inputs.runs-on \|\| 'ubuntu-24.04-arm' }}
	steps:
	- name: Checkout code
	uses: actions/checkout@v6
	with:
	ref: ${{ github.event.pull_request.head.sha }}
	allow-unsafe-pr-checkout: true
	persist-credentials: false

	- name: Check for cached sources
	id: cache-check
	uses: actions/cache@v5
	with:
	path: depends/sources
	key: depends-sources-${{ hashFiles('depends/packages/*') }}
	restore-keys: depends-sources-
	lookup-only: true

	- name: Download sources
	if: steps.cache-check.outputs.cache-hit != 'true'
	run: make -C depends download