That template does not work now. This is the build logs:
[Region: us-west1]
==============
Using Nixpacks
==============
context: 6975bab838bae93e592b14b85b21c505
╔══════════════ Nixpacks v1.19.0 ═════════════╗
║ setup │ nodejs_21, yarn-1_x ║
║─────────────────────────────────────────────║
║ install │ yarn install --frozen-lockfile ║
║─────────────────────────────────────────────║
║ build │ yarn run build ║
║─────────────────────────────────────────────║
║ start │ yarn run start ║
╚═════════════════════════════════════════════╝
#0 building with “default” instance using docker driver
#1 [internal] load .dockerignore
#1 transferring context: 2B done
#1 DONE 0.0s
#2 [internal] load build definition from Dockerfile
#2 transferring dockerfile: 2.81kB done
#2 DONE 0.0s
#3 [internal] load metadata for Package nixpacks · GitHub
#3 DONE 0.3s
#4 [stage-0 1/10] FROM ghcr.io/railwayapp/nixpacks:ubuntu-1699920194@sha256:c861ec45a7401768f59183a4a51056daf7dd26ab9a5215836c81b09725b9cbb6
#4 DONE 0.0s
#5 [internal] load build context
#5 transferring context: 481.96kB done
#5 DONE 0.0s
#6 [stage-0 2/10] WORKDIR /app/
#6 CACHED
#7 [stage-0 3/10] COPY .nixpacks/nixpkgs-bf744fe90419885eefced41b3e5ae442d732712d.nix .nixpacks/nixpkgs-bf744fe90419885eefced41b3e5ae442d732712d.nix
#7 CACHED
#8 [stage-0 4/10] RUN nix-env -if .nixpacks/nixpkgs-bf744fe90419885eefced41b3e5ae442d732712d.nix && nix-collect-garbage -d
#8 CACHED
#9 [stage-0 5/10] COPY . /app/.
#9 DONE 0.0s
#10 [stage-0 6/10] RUN --mount=type=cache,id=s/52d35a24-7f70-4aba-a6e8-f6e3ddcc1bc9-/usr/local/share/cache/yarn/v6,target=/usr/local/share/.cache/yarn/v6 yarn install --frozen-lockfile