[Bug]: Nextjs Deployment failed on v4.0.0-beta.389 with Nixpacks

[ScorpyG]

Error Message and Logs

My failed deployment resulted from missing/undefined $NIXPACKS_PATH and incompatible node engine. Both are un-configurable on my end. Since I'm on the latest version of coolify I figured create an issue to echo the problem. Screenshot of the error log down below

Steps to Reproduce

1. Connect Coolify to Github App
2. Create Resource for one of the Next.js repo
3. Select Nixpacks as Build Pack (keeping the default config for port and everything else)
4. Hit the Deploy button and pray

Example Repository URL

No response

Coolify Version

v4.0.0-beta.389

Are you using Coolify Cloud?

No (self-hosted)

Operating System and Version (self-hosted)

Ubuntu 24.10

Additional Information

No response

[fabianbeier]

Have the exact same problem since yesterday with a Strapi instance. Tried #4871 (comment) but it didn't resolve the issue.

79.61 npm error A complete log of this run can be found in: /root/.npm/_logs/2025-01-25T00_15_30_038Z-debug-0.log
------
 1 warning found (use docker --debug to expand):
 - UndefinedVar: Usage of undefined variable '$NIXPACKS_PATH' (line 18)
Dockerfile:20
--------------------
  18 |     ENV NIXPACKS_PATH=/app/node_modules/.bin:$NIXPACKS_PATH
  19 |     COPY . /app/.
  20 | >>> RUN --mount=type=cache,id=vko0coos8w8gkg4og8sg0oso-/usr/local/share/cache/yarn/v6,target=/usr/local/share/.cache/yarn/v6 npm install --frozen-lockfile --ignore-engines --legacy-peer-deps

[ScorpyG]

Hmm after digging around, one of my dependencies graphql-ws required node version >= 20 that is conflicted with the default node environment (v18.20.2) that was used by Nixpacks resulted in the error above. As stated in the error log so I added the minimum node version requirement into package.json as suggested by one of the Coolify community member.

...
"engines": {
  "node": ">= 20"
}
...