anchor.diff:  
   RUN npm run build
   
  -CMD [ "/bin/bash", "-c", "npm run start" ]
  +CMD [ "/bin/sh", "-c", "npm run start" ]
  
positive.code: COPY package.json yarn.lock ./
  
  # install dev dependences because they're used by yarn build
  RUN /bin/bash -c "NODE_ENV=development yarn"
  
  RUN npm rebuild node-sass
  RUN cd /usr/src/app/node_modules/nhsuk-frontend && npm run postinstall
  
negative.code: FROM node:7.8-alpine
  
  ENV NODE_ENV ${NODE_ENV:-development}
  ENV PORT ${PORT:-3333}
  