message: Add Kitware package repository to Docker image
diff: @@ -5,7 +5,9 @@ RUN apt update \
  gnupg \
  dirmngr \
  && curl -fsSL https://cli.github.com/packages/githubcli-archive-keyring.gpg | gpg --dearmor -o /usr/share/keyrings/githubcli-archive-keyring.gpg \
  + && curl -fsSL https://apt.kitware.com/keys/kitware-archive-latest.asc | gpg --dearmor -o /usr/share/keyrings/kitware-archive-keyring.gpg \
  && echo "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/githubcli-archive-keyring.gpg] https://cli.github.com/packages stable main" | tee /etc/apt/sources.list.d/github-cli.list > /dev/null \
  + && echo "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/kitware-archive-keyring.gpg] https://apt.kitware.com/ubuntu/ focal main" | tee /etc/apt/sources.list.d/kitware.list > /dev/null \
  && apt update \
  && apt install -y \
  clang \
  