Docker compose for Vuejs Projects

docker-compose.yml

version: '2'

services:
  #------------------------------------------------------------
  # Web server - For live reload and development
  # This environment can be used to run npm and node
  # commands as well
  # Credits: http://github.com/codecasts/ambientum
  #------------------------------------------------------------
  dev:
    image: ambientum/node:6
    container_name: sandbox-vue-dev
    command: npm run dev
    volumes:
      - .:/var/www/app
    ports:
      - 8080:8080

  # Testing dist on a "real" webserver
  production-server:
    image: nginx:stable-alpine
    container_name: sandbox-preview-server
    volumes:
      - ./dist:/usr/share/nginx/html
    ports:
      - 9090:80

Why does Vue.js follow this npm run dev init format instead of npm start? I have to reconfigure for cloud architecture due to this with dynamic environment.

/end rant