anchor.diff:  
   # Start app
   EXPOSE 3000
  -CMD ["node", "."]+CMD ["node", "."]
  
positive.code: COPY package.json /usr/src/app/
  COPY package-lock.json /usr/src/app/
  RUN npm install
  
  # env variables
  ARG app
  
negative.code: FROM node:alpine
  
  # Create app dir
  RUN mkdir -p /usr/src/app
  