I'm attempting to build a Vite + React + TS app with a python backend and I keep getting an error. Here is the output logs. I followed the recommendation here https://help.railway.app/questions/i-can-t-deploy-a-vite-react-typescript-a-0b08e2bc and used a Caddyfile and nixpacks.toml instead of a start command. What might I be doing wrong?

```[Region: us-west1]

==============

Using Nixpacks

==============

context: 0c66ed74176d13e20ee66dd48c49d269

Nixpacks build failed

╔════════ Nixpacks v1.29.0 ═══════╗

║ setup │ nodejs18, npm-9x ║

║─────────────────────────────────║

║ install │ npm ci ║

║─────────────────────────────────║

║ start │ ║

╚═════════════════════════════════╝

Error: No start command could be found

```

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