act runner uses bare ubuntu:24.04 without Node.js — actions/checkout,
actions/upload-artifact, etc. all fail. Replace with plain git clone
and shell commands.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
The act runner doesn't have Node.js in the rust:1-bookworm container,
breaking JS-based actions (checkout, cache, upload-artifact).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>