anchor.diff: -FROM ubuntu:18.04 as builder
  +FROM docker.io/library/ubuntu:20.04 as builder
   
   # Install dependencies
   ENV DEBIAN_FRONTEND=noninteractive
  
positive.code:     apache2 \
      curl \
      git \
      libapache2-mod-php7.2 \
      php7.2 \
      php7.2-mysql \
      python3.4 \
      python3-pip
  RUN pip3 install grpcio grpcio-tools
  
negative.code:     --grpc_python_out=. \
      ../../../examples/protos/cloudcity.proto
  
  FROM docker.io/library/ubuntu:20.04
  RUN apt-get update \
      && DEBIAN_FRONTEND=noninteractive apt-get upgrade -y --no-install-recommends \
  	&& DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
  