anchor.diff: -FROM debian:jessie
  +FROM debian:stretch
   
   MAINTAINER MacArthur Lab
   
  
positive.code:     && echo "deb http://packages.cloud.google.com/apt $CLOUD_SDK_REPO main" > /etc/apt/sources.list.d/google-cloud-sdk.list \
      && curl https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add - \
      && apt-get update && apt-get install -y \
          google-cloud-sdk
  
  RUN curl -LO https://storage.googleapis.com/kubernetes-release/release/$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/linux/amd64/kubectl \
      && chmod +x ./kubectl \
  
negative.code: RUN apt-get update \
      && curl -sL https://deb.nodesource.com/setup_8.x | bash - \
      && apt-get install -y \
          nodejs \
      && apt-get clean \
      && rm -rf /var/lib/apt/lists/*
  
  # install database clients for debugging (https://www.postgresql.org/download/linux/debian/)
  RUN echo "deb http://apt.postgresql.org/pub/repos/apt $(lsb_release -cs)-pgdg main" > /etc/apt/sources.list.d/pgdg.list \
      && wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | apt-key add - \
      && apt-get update && apt-get install -y \
          postgresql \
          postgresql-client \
          libpq-dev \
      && apt-get clean \
      && rm -rf /var/lib/apt/lists/*
  
  RUN apt-get update && apt-get install -y \
      redis-tools \
      && apt-get clean \
      && rm -rf /var/lib/apt/lists/*
  
  # install gcloud tools
  RUN CLOUDSDK_CORE_DISABLE_PROMPTS=1 \
      && curl https://sdk.cloud.google.com | bash \
      && apt-get update && apt-get install -y \
          gcc \
          libpq-dev \
      && apt-get clean \
      && rm -rf /var/lib/apt/lists/* \
      && pip install gsutil
  
  RUN CLOUDSDK_CORE_DISABLE_PROMPTS=1 \
  