anchor.diff:  RUN groupadd --gid 1000 ubuntu && \
     useradd --uid 1000 --gid ubuntu --groups 0 --shell /bin/bash --home-dir ${HOME} --create-home ubuntu
   
  -RUN chmod -R a+rw /usr
  +
  +RUN chown -R ubuntu:0 ${APP_ROOT} ${HOME} && \
  +  chmod -R g=u ${APP_ROOT} ${HOME}
   
   # Docker client and group
   
  
positive.code: ENV RUST_BACKTRACE=1 \
    PATH=${HOME}/.cargo/bin:$PATH
  
  RUN set -ex ;\
    curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain none -y ; \
    rustup toolchain install 1.36.0
  
  # Mix and Rebar
  
  
negative.code: 
  ## Gradle
  
  RUN apt-get update && apt-get install -y --no-install-recommends openjdk-8-jre-headless gradle && \
      rm -rf /var/lib/apt/lists/*
  
  ## Node.js
  