message: get latest and greatest clang-format.
diff: @@ -5,8 +5,14 @@ FROM python:3.9.0-buster
  LABEL maintainer="Pete Warden <petewarden@google.com>"
  -RUN apt-get update && apt-get install -y zip xxd
  -RUN pip install clang-format
  +RUN echo deb http://apt.llvm.org/buster/ llvm-toolchain-buster main > /etc/apt/sources.list.d/llvm.list
  +RUN wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | apt-key add -
  +
  +RUN apt-get update
  +
  +RUN apt-get install -y zip xxd
  +RUN apt-get install -y clang-format
  +
  RUN pip install six
  # Install Renode test dependencies
  RUN pip install pyyaml requests psutil robotframework==3.1
  