gplugin/builders

Add gtk4 to everything and remove debian bullseye as it doesn't have gtk4
FROM gplugin/builders:debian-bullseye-amd64
RUN set -ex && \
apt-get update && \
apt-get install -y --no-install-recommends clang-tools && \
apt-get clean && \
rm -rf /var/lib/apt/lists
COPY scanbuild/build.sh /