We have a monorepo with 3 services (backend, frontend, bots), each with its own Dockerfile. We initially tried deploying each service individually by setting Root Directory: apps/[service], but ran into build failures because workspace dependencies (shared packages) are outside the build context.

We're now deploying all services from the repository root (Root Directory: .,Dockerfile Path: apps/[service]/Dockerfile), which resolves the workspace dependencies.

Questions:

1. Is this the recommended approach for monorepos with shared packages?

2. In the template editor, I can configure source/root directory but not explicitly choose Docker vs Buildpacks - does Railway auto-detect from Dockerfile presence?

3. Any best practices or gotchas we should know about?

Structure:
/
├── apps/
│   ├── backend/Dockerfile
│   ├── frontend/Dockerfile
│   └── bots/Dockerfile
├── packages/
│   └── shared/ (workspace dependencies)
├── Cargo.toml (Rust workspace)
└── package.json (Bun workspace)