Shipping TanStack Start and Bun to Railway

Railway's Nixpacks autobuild detects Bun projects fine, but it can't sequence the combination this site needs: prisma generate at build time, Vite + the TanStack Start plugin, a custom server.ts entry, and prisma migrate deploy on boot. A four-stage Dockerfile is simpler than teaching Nixpacks all of that. The full post walks through the recipe: two parallel bun install stages (one full, one production-only), a build stage that runs prisma generate against a dummy DATABASE_URL , a lean runtime t