Warm source caches #4

	# SPDX-FileCopyrightText: 2026 Alexandre Gomes Gaigalas <alganet@gmail.com>
	# SPDX-License-Identifier: ISC

	name: Warm source caches

	# Per-target source tarballs live only in the GitHub Actions cache — the
	# committed checksums under checksums/sources/ are hashes, not bytes — and that
	# cache evicts entries after 7 days without access. The build workflow now skips
	# unchanged targets and no longer runs a bulk download job, so a rarely-rebuilt
	# target's source cache could otherwise expire; if upstream had since removed
	# the tarball, a later rebuild would fail. This job restores (and re-fetches on a
	# miss) every source on a cadence well under the 7-day TTL, keeping the bytes
	# available. It runs on the default branch so the caches land in main's scope,
	# where both main builds and PRs can restore them.

	on:
	schedule:
	# Mon & Thu — max gap 4 days, comfortably under the 7-day cache TTL.
	- cron: "0 4 * * 1,4"
	workflow_dispatch:

	permissions:
	contents: read

	jobs:
	warm:
	runs-on: ubuntu-24.04
	steps:
	- uses: actions/checkout@v7
	# Restores every per-target source cache (refreshing its TTL) and
	# re-fetches+saves any that have been evicted.
	- uses: ./.github/actions/downloads

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