anchor.diff:  
   # Create non-root `worker` user and use it's home dir
   # to copy files into
  -RUN useradd -m worker
  +RUN useradd --create-home worker
   WORKDIR /home/worker
   
   # Install Python dependencies
  
positive.code:         python3-pip
  
  # Install Node.js and npm. 
  RUN curl -sL https://deb.nodesource.com/setup_12.x | bash - \
   && apt-get update \
   && apt-get install -y \
          nodejs \
  
negative.code: FROM ubuntu:20.04
  
  ARG DEBIAN_FRONTEND=noninteractive
  ARG APT_KEY_DONT_WARN_ON_DANGEROUS_USAGE=1
  
  # Install system dependencies
  RUN apt-get update \
  