21a538cbb8
Astro 6.x requires Node >=22.12.0. The previous Dockerfile used node:20-alpine, which the Astro CLI rejected with: Node.js v20.20.2 is not supported by Astro! Please upgrade Node.js to a supported version: ">=22.12.0" EasyPanel pulled the change, ran the build, and failed at `RUN npm run build`. Bumping to node:22-alpine fixes it. Also added two 'common failure' sections to docs/ci-setup.md covering the nixpacks 'No start command' and Node version mismatch errors we just hit.