version: '3.1'
services:
  postgres:
    image: postgres
    expose:
      - '5432'
    networks:
      - private
  web:
    build: .
    command: npm start
    ports:
     - "8080:8080"
    volumes:
     - .:/code
    depends_on:
      - db
    environment:
      DATABASE_URL=postgres://postgres:@db:5432