Make appliance build pipeline work on Ubuntu #6
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The build stopped working a long time ago, and more cruft would accumulate.
The MacOS runner images were originally used because they were the only ones that would suppport VirtualBox and virtualization within virtualization. The macos-12 image we were dependent on has since been deprecated and macos-13, macos-14 and macos-15 have since been introduced: But these runners all operate on Apple Silicon and do not feature VirtualBox (which is an x86 hypervisor).
It seems the latest ubuntu runners do support virtualization within virtualization, so this updates the pipeline to build using Ubuntu instead.