anchor.diff:  # Build production gems
   FROM        bundle as bundle-prod
   LABEL       stage=build
  +LABEL       project=avalon
   RUN         bundle install --without development test --with aws production postgres
   
   
   # Install node modules
   FROM        node:12-buster-slim as node-modules
   LABEL       stage=build
  +LABEL       project=avalon
   RUN         apt-get update && apt-get install -y --no-install-recommends git
   COPY        package.json .
   COPY        yarn.lock .
  
positive.code: # 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 \
  
negative.code: # Build devevelopment image
  FROM        base as dev
  LABEL       stage=final
  LABEL       project=avalon
  RUN         apt-get install -y --no-install-recommends --allow-unauthenticated \
              build-essential \
              gcc-7 \
  