anchor.diff:  
   # Build production assets
   FROM        base as assets
  +LABEL       stage=build
   COPY        --from=bundle-prod --chown=app:app /usr/local/bundle /usr/local/bundle
   COPY        --chown=app:app . .
   COPY        --from=node-modules --chown=app:app /node_modules ./node_modules
  
positive.code: # Base stage for building gems
  FROM        ruby:2.5-buster as bundle
  
  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=build
  RUN         apt-get install -y --no-install-recommends --allow-unauthenticated \
              build-essential \
              gcc-7 \
  