Railway Monorepo Variable Environment

Well, it didn’t detect as much as I expected. Turned out, the easiest way is to have nixpacks.toml at the root.

And if you notice the start command, that is where the “cd apps/web” fix the issue. Then Railway able to inject the variable accordingly.

# Nixpacks configuration for monorepo deployment
# This file tells Railway how to build and deploy our Next.js app from a monorepo

[phases.setup]
nixPkgs = ["nodejs_18", "pnpm"]

[phases.install]
cmd = "corepack enable && pnpm install --frozen-lockfile"

[phases.build]
cmd = "turbo build -F web"

[start]
cmd = "cd apps/web && pnpm start" 

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