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init warpbuild caching

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# WarpBuild Checkout
This is [WarpBuild's](https://warpbuild.com) fork of `actions/checkout`, a drop-in
replacement that adds a **git mirror cache**: on WarpBuild runners, a tar of the repo's
bare mirror is restored from S3 into `.git/wb-mirror.git` and wired up via git
alternates, so the fetch from GitHub downloads only the delta instead of the whole
repository. On a cache miss, the run hydrates the mirror once (full clone + upload);
mirrors expire on a server-configured TTL and re-hydrate.
- Zero new inputs — behavior is identical to upstream everywhere except WarpBuild runners.
- Fail-open — any cache error degrades to stock `actions/checkout` behavior.
- All fork code lives in `src/warpbuild/`
---
[![Build and Test](https://github.com/actions/checkout/actions/workflows/test.yml/badge.svg)](https://github.com/actions/checkout/actions/workflows/test.yml)
# Checkout v7