anchor.diff:  RUN chown autolab:autolab autolab
   RUN chown autolab:autolab output
   RUN chown autograde:autograde autograde
  -RUN apt-get install -y git
  -RUN git clone https://github.com/autolab/Tango.git
  +RUN git clone --depth 1 https://github.com/autolab/Tango.git
   WORKDIR Tango/autodriver
   RUN make clean && make
   RUN cp autodriver /usr/bin/autodriver
  
positive.code: 
  # Clean up
  WORKDIR /home
  RUN apt-get remove -y git
  RUN apt-get -y autoremove
  RUN rm -rf Tango/
  
  # Check installation
  RUN ls -l /home
  
negative.code: # Autolab - autograding docker image
  
  FROM ubuntu:18.04
  MAINTAINER Autolab Team <autolab-dev@andrew.cmu.edu>
  
  RUN apt-get update && apt-get install -y \
    build-essential \
    gcc \
    git \
    make \
    sudo \
    && rm -rf /var/lib/apt/lists/*
  
  # Install autodriver
  WORKDIR /home
  