multiple fixes to vulkan build:
- use ubuntu 26.04 to be compatible with AMD 395+ (Strix halo) hardware
- add home directory in container
- fix stable-diffusion install to actually enable vulkan
---------
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
- set up a GHA scheduled job to build the container nightly
- enabling pushing a llama-swap:unified and a llama-swap:unified-Y-M-D
image to ghcr.io
- tidy up Dockerfile to use a non-root user and llama-swap as an entry
point
Benson Wong