Automate image build process

[aktech]

An attempt to automate the manual process of image build and upload to openstack

• GitHub workflow to automate VM image builds via SSH to GPU server
• Install uv to temporary directory for complete isolation per run
• Job summary showing actual build and upload status (success/failed/skipped)
• Makefile with build orchestration and configurable UV path
• Sequential builds (max-parallel: 1) to prevent apt lock conflicts
• Automatic cleanup of temp directories (/tmp/repo-*, /tmp/uv-*)
• Fixed CUDA element to use linux-headers-generic instead of host kernel version
• Updated README with make commands and requirements
• Added pyproject.toml for uv dependency management
• Install Node and 7zip

[jaimergp]

Some questions if they need to be clarified.

[jaimergp]

Thanks!