anchor.diff:  ### License parser
   RUN go get github.com/coreos/license-bill-of-materials
   
  -### Install Terraform, NodeJS and Yarn
  +### Install Shellcheck, Terraform, NodeJS and Yarn
  +ENV SHELLCHECK_VERSION="v0.4.6"
   ENV TERRAFORM_VERSION="0.9.6"
   ENV NODE_VERSION="v8.1.2"
   ENV YARN_VERSION="v0.24.6"
  
positive.code: 
  RUN apt-get update && \
      apt-get install --no-install-recommends -y -q \
      build-essential sudo curl wget git autoconf automake unzip libtool jq shellcheck awscli gnupg1 \
      openvpn xvfb xauth
  
  # Install Terraform
  
negative.code:     mv /tmp/dist /usr/local/yarn && \
      ln -s /usr/local/yarn/bin/yarn /usr/local/bin/yarn
  
  # Install Shellcheck
  RUN cd /tmp && \
      wget --quiet https://storage.googleapis.com/shellcheck/shellcheck-${SHELLCHECK_VERSION}.linux.x86_64.tar.xz && \
      tar xJf shellcheck-${SHELLCHECK_VERSION}.linux.x86_64.tar.xz && \
      mv /tmp/shellcheck-${SHELLCHECK_VERSION}/shellcheck /usr/local/bin/shellcheck
  
  # Install Chrome for installer gui tests
  # Use Chrome beta because v60 or higher is needed for headless mode
  RUN wget --quiet -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add - && \
  