anchor.diff:  
   RUN chmod +x /usr/local/bin/dumb-init
   
  -RUN apt-key adv --keyserver pgp.mit.edu --recv D101F7899D41F3C3 && \
  -    echo "deb http://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list && \
  -    apt-get update -qq && \
  -    apt-get install -y -qq yarn && \
  -    yarn --version
  -
  -WORKDIR /opt/app
  +WORKDIR /usr/src/app
   
   COPY package.json yarn.lock ./
   
  
positive.code: FROM node:6.9.4
  
  MAINTAINER Hung Phan
  
  
negative.code: 
  COPY . .
  
  RUN npm run build
  
  CMD ["dumb-init", "npm", "start"]
  