anchor.diff:  
   RUN RAILS_ENV=production bundle exec rake assets:clean assets:precompile assets:non_digested SECRET_KEY_BASE=required_but_does_not_matter_for_assets 2> /dev/null
   
  +ENV PUMA_PORT 3000
  +EXPOSE $PUMA_PORT
  +
   RUN chown -R appuser:appgroup ./*
   RUN chmod +x /usr/src/app/config/docker/*
  +
  +# expect/add ping environment variables
  +ARG VERSION_NUMBER
  +ARG COMMIT_ID
  +ARG BUILD_DATE
  +ARG BUILD_TAG
  +ENV VERSION_NUMBER=${VERSION_NUMBER}
  +ENV APP_GIT_COMMIT=${COMMIT_ID}
  +ENV APP_BUILD_DATE=${BUILD_DATE}
  +ENV APP_BUILD_TAG=${BUILD_TAG}
  
positive.code:     clamav-daemon \
      clamav-freshclam
  
  # ENV RAILS_ENV='production'
  COPY Gemfile* ./
  
  # Set this to any value ("1", "true", etc) to enable development mode.
  # e.g. docker build --build-arg development_mode=1 ...
  ARG development_mode
  
  RUN echo "development_mode=$development_mode"
  RUN bundle config --global frozen 1 && \
      bundle install ${development:+--with="test development"}
  
  COPY . .
  
  RUN mkdir log tmp
  
negative.code: RUN addgroup --gid 1000 --system appgroup && \
      adduser --uid 1000 --system appuser --ingroup appgroup
  
  WORKDIR /usr/src/app/
  
  COPY Gemfile* ./
  
  RUN bundle config --global frozen 1 && \
      bundle config --path=vendor/bundle && \
      bundle install --without development test
  
  RUN apt-get update && \
      apt-get install -y apt-transport-https && \
  