Gulp with Docker

gistfile1.txt

gitlab-ci.yml file looks like:
image: runejuhl/nodejs-build:latest

stages:
  - test
  - build

test:
  stage: test
  script:
    - ls ./


build:
  stage: build

  script:
    - npm run build
    
 Docker Image:
 
 # Ubuntu xenial with nodejs and npm packaging

FROM runejuhl/xenial-generic-build:latest
MAINTAINER Rune Juhl Jacobsen <runejuhl@enableit.dk>

WORKDIR /tmp

RUN apt-get update
RUN apt-get install -y \
    nodejs             \
    nodejs-dev         \
    npm

RUN npm install --global gulp-cli

RUN ln -s /usr/bin/nodejs /usr/bin/node

# clean a bit
RUN apt-get autoremove -y
RUN apt-get autoclean -y
    

$ npm run build

Obmondo-frontend@1.0.0 build /builds/obmondo/uiwork
gulp

module.js:328
throw err;
^

Error: Cannot find module 'run-sequence'
at Function.Module._resolveFilename (module.js:326:15)
at Function.Module._load (module.js:277:25)
at Module.require (module.js:354:17)
at require (internal/module.js:12:17)
at Object. (/builds/obmondo/uiwork/gulpfile.js:6:19)
at Module._compile (module.js:410:26)
at Object.Module._extensions..js (module.js:417:10)
at Module.load (module.js:344:32)
at Function.Module._load (module.js:301:12)
at Module.require (module.js:354:17)

dev dependency error but my package.json have dev dependencies