[Merge] ~adam-retter/uvtool:emu-riscv64 into uvtool:main

[Christian Ehrhardt ]

I also found that the detection and auto-selection of the bootloader in libvirt isn't great yet for this case.
So you can keep specifying /var/lib/uvtool/libvirt/images/jammy-test-riscv64-v2.qcow in the template.

+1 on that
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https://code.launchpad.net/~adam-retter/uvtool/+git/uvtool/+merge/457345
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