All of our python based containers are running on Ubuntu Noble now which
means we can run them with specualtive image testing when hosting the
images on quay.io. Move the python base images over to match.
Note that we continue to build the container images with docker, but
use-buildset-registry configures buildkit (which is the default docker
image builder) to use mirrors properly. The image build process doesn't
have the same problems as the runtime execution of containers when it
comes to using mirrors for different registries. What this means is
everything should work as expected. The uwsgi-base python3.12 image
build should exercise this within this change. There is no existing
python3.12 image on quay.io for python-builder and python-base which
uwsgi-base uses to build its python3.12 image. This means it will be
forced to use speculative image builds.
Change-Id: I06c3dd0008a5095e7a1c44977625c907ab9c1b83
bfa363d9dd