Can't build default dockerfile - react-router: not found

[jansg08]

I'm trying to build an image with the dockerfile provided, but I keep getting the error 'sh: react-router: not found' during the RUN npm run build line in the dockerfile.

I don't know if it's relevant but I'm running Ubuntu Server 24.04.2 LTS.

Docker output in terminal:

 => [internal] load build definition from Dockerfile                                                                                            0.0s
 => => transferring dockerfile: 639B                                                                                                            0.0s
 => [internal] load metadata for docker.io/library/node:20-alpine                                                                               0.9s
 => [internal] load .dockerignore                                                                                                               0.0s
 => => transferring context: 82B                                                                                                                0.0s
 => [internal] load build context                                                                                                               0.0s
 => => transferring context: 12.64kB                                                                                                            0.0s
 => CACHED [development-dependencies-env 1/4] FROM docker.io/library/node:20-alpine@sha256:d3507a213936fe4ef54760a186e113db5188472d9efdf491686  0.0s
 => [development-dependencies-env 2/4] COPY . /app                                                                                              0.1s
 => [build-env 2/5] COPY . /app/                                                                                                                0.1s
 => CACHED [production-dependencies-env 2/4] COPY ./package.json package-lock.json /app/                                                        0.0s
 => CACHED [production-dependencies-env 3/4] WORKDIR /app                                                                                       0.0s
 => CACHED [production-dependencies-env 4/4] RUN npm ci --omit=dev                                                                              0.0s
 => CACHED [stage-3 3/5] COPY --from=production-dependencies-env /app/node_modules /app/node_modules                                            0.0s
 => [development-dependencies-env 3/4] WORKDIR /app                                                                                             0.0s
 => [development-dependencies-env 4/4] RUN npm ci                                                                                             141.0s
 => [build-env 3/5] COPY --from=development-dependencies-env /app/node_modules /app/node_modules                                                0.1s
 => [build-env 4/5] WORKDIR /app                                                                                                                0.0s
 => ERROR [build-env 5/5] RUN npm run build                                                                                                     5.4s
------
 > [build-env 5/5] RUN npm run build:
0.424 
0.424 > build
0.424 > react-router build
0.424 
0.427 sh: react-router: not found
------
Dockerfile:15
--------------------
  13 |     COPY --from=development-dependencies-env /app/node_modules /app/node_modules
  14 |     WORKDIR /app
  15 | >>> RUN npm run build
  16 |     
  17 |     FROM node:20-alpine
--------------------
ERROR: failed to solve: process "/bin/sh -c npm run build" did not complete successfully: exit code: 127