anchor.diff:  # required for golang: ca-certificates, gcc, libc-dev, git
   # required for general build: make, wget, curl
   # required for ruby: libcurl4-openssl-dev
  +# required for python: python3
   # hadolint ignore=DL3008
   RUN apt-get update && apt-get install -y --no-install-recommends \
       ca-certificates \
  
positive.code: 
  FROM ubuntu:xenial as nodejs_tools_context
  
  ENV NODEJS_VERSION=12.8.0
  ENV MARKDOWN_SPELLCHECK_VERSION=v1.3.1
  ENV SASS_LINT_VERSION=v1.13.1
  ENV TYPESCRIPT_VERSION=v3.5.3
  ENV TSLINT_VERSION=v5.18.0
  ENV SASS_VERSION=v1.22.10
  ENV SVGO_VERSION=v1.3.0
  ENV SVGSTORE_CLI_VERSION=v1.3.1
  ENV BABEL_CLI_VERSION=v7.5.5
  ENV BABEL_CORE_VERSION=v7.5.5
  ENV BABEL_PRESET_ENV=v7.5.5
  ENV BABEL_PRESET_MINIFY_VERSION=v0.5.1
  ENV BABEL_POLYFILL_VERSION=v7.4.4
  
  ADD https://nodejs.org/download/release/v${NODEJS_VERSION}/node-v${NODEJS_VERSION}-linux-x64.tar.gz /tmp
  RUN tar -xzf /tmp/node-v${NODEJS_VERSION}-linux-x64.tar.gz --strip-components=1 -C /usr/local
  
negative.code: 
  FROM ubuntu:xenial as ruby_tools_context
  
  # Pinned versions of stuff we pull in
  ENV AWESOMEBOT_VERSION=1.19.1
  ENV HTMLPROOFER_VERSION=3.9.2
  ENV MDL_VERSION=0.5.0
  ENV RUBY_VERSION=2.6.3
  
  RUN apt-get -y update && apt-get -y install --no-install-recommends \
      build-essential \
  