CI: Vulkan container image builds failing

[geraname]

The Vulkan container image builds have been failing for the last few days.

These are the jobs that have failed so far:

• https://github.com/ggml-org/llama.cpp/actions/runs/23036627015/job/66906129376
• https://github.com/ggml-org/llama.cpp/actions/runs/22987035100/job/66739587740
• https://github.com/ggml-org/llama.cpp/actions/runs/22937218234/job/66571182057
• https://github.com/ggml-org/llama.cpp/actions/runs/22887559149/job/66403648665

This appears caused by Python dependencies being unable to satisfy the constraint torch~=2.6.0.

I have tested bumping the requirement to torch~=2.9.0 in requirements/requirements-convert_hf_to_gguf.txt, and the Vulkan image builds successfully. However, I don't suppose that this bump can be done without affecting something else due to breaking changes in PyTorch. Since the other container images are not failing to build with the same requirements, perhaps there is a simpler solution that would address this.

[CISC]

Hmmm, they must have removed 2.6.0 packages for Python 3.14 for some reason?

Edit: Or did 26.04 image just recently bump Python version?

[geraname]

As far as I could see, Ubuntu Resolute (i.e. 26.04) currently defaults to Python 3.14.

PyTorch 2.9.0 seems like the oldest version that works with it. As I understand it, current 2.6.0 requires 3.10 to 3.13.

Let me test explicitly installing python3.13 in the Dockerfile for Vulkan.

[geraname]

Forcing python3.13 seems to fix it. I will open a PR 👍