anchor.diff:  # Base stage for building gems
   FROM        ruby:2.5-buster as bundle
  -
  +LABEL       stage=build
   RUN     echo "deb http://deb.debian.org/debian buster-backports main" >> /etc/apt/sources.list && \
           apt-get update && apt-get upgrade -y build-essential \
            && apt-get install -y --no-install-recommends \
  
positive.code: 
  # Build production gems
  FROM        bundle as bundle-prod
  RUN         bundle install --without development test --with aws production postgres
  
  
  # Install node modules
  FROM        node:12-buster-slim as node-modules
  RUN         apt-get update && apt-get install -y --no-install-recommends git
  COPY        package.json .
  COPY        yarn.lock .
  
negative.code: 
  # Build devevelopment image
  FROM        base as dev
  LABEL       stage=build
  RUN         apt-get install -y --no-install-recommends --allow-unauthenticated \
              build-essential \
              gcc-7 \
  