***UPDATE: SOLVED***
Builds fail during the "Build image" step with the message: "Failed to build an image. Please check the build logs for more details."

Build logs

The build logs only show:

• scheduling build on Metal builder "builder-hdvmmv"

• No npm install, npm ci, or node ace build output

• No error messages or stack traces

What we’ve tried

1. nixpacks.toml – Node 22, NPM_CONFIG_PRODUCTION=false, explicit build commands (npm ci, node ace build) – no change

1. Dockerfile – Multi-stage build with Node 22 Alpine – same failure

Context

• Tests pass locally and in GitHub Actions (Node 22)

• Deployment triggered by GitHub merge to main

• AdonisJS 6 app, TypeScript, package.json build script: node ace build

• Start command: node build/bin/server.js

• Railway status shows recent "Builds may experience failure" incident (resolved Feb 3)

Any ideas?