CUDA Dockerfile

[Nauscar]

This PR adds a cuda variant to the github workflows build.yml.
Version 12.6.3 was used as it is still currently maintained and supports more devices.

This was tested locally using podman on Fedora Silverblue with the following commands:

podman build -f Dockerfile.cuda -t stable-diffusion.cpp:master-cuda  .
podman run --rm --userns=keep-id --security-opt=label=type=nvidia_container_t --device nvidia.com/gpu=all localhost/stable-diffusion.cpp:master-cuda --version

Thanks for all your efforts on stable-diffusion.cpp!

[Nauscar]

Something to note, none of the existing Dockerfiles have ARG DEBIAN_FRONTEND=noninteractive. I didn't include this in case its ommision was intentional.