We add a node service that we can use to build our static assets:

version: '3'
services:
  app:
    build:
      context: ./docker/app
      dockerfile: Dockerfile
    image: shippingdocker/app:latest
    networks:
     - appnet
    volumes:
     - .:/var/www/html
    ports:
     - ${APP_PORT}:80
    working_dir: /var/www/html
  cache:
    image: redis:alpine
    networks:
     - appnet
    volumes:
     - cachedata:/data
  db:
    image: mysql:5.7
    environment:
      MYSQL_ROOT_PASSWORD: secret
      MYSQL_DATABASE: homestead
      MYSQL_USER: homestead
      MYSQL_PASSWORD: secret
    ports:
     - ${DB_PORT}:3306
    networks:
     - appnet
    volumes:
     - dbdata:/var/lib/mysql
  node:
    build:
      context: ./docker/node
      dockerfile: Dockerfile
    image: shippingdocker/node:latest
    networks:
     - appnet
    volumes:
     - .:/opt
    working_dir: /opt
    command: echo hi
networks:
  appnet:
    driver: bridge
volumes:
  dbdata:
    driver: local
  cachedata:
    driver: local

We build this image also, so we can add things like git and yarn to it. This uses the official node base image. Here's the Dockerfile:

FROM node:latest

LABEL maintainer="Chris Fidao"

RUN curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add - \
    && echo "deb http://dl.yarnpkg.com/debian/ stable main" > /etc/apt/sources.list.d/yarn.list \
    && apt-get update \
    && apt-get install -y git yarn \
    && apt-get -y autoremove \
    && apt-get clean \
    && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*

Docker Compose takes care of building this image for us when we first spin up the environment.