Cannot build release.nix without KVM

[Demi Marie Obenour <demiobenour@gmail.com>]

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On a Qubes OS VM (which doesn't have nested virtualization), building
release.nix fails because start-vmm-test (rightly) errors out.  Having
KVM be a *build*-time dependency of Spectrum OS seems rather strict,
especially because I can always copy the generated files over to another
machine and run them there.  In particular, I can copy the resulting image
and run it in QEMU.

Ideally I could use Nix's remote build support for this.  However, that
is designed for the case where I am offloading work to a powerful and
trusted server, whereas in my case the remote machine is for testing
purposes only.  Therefore, to save money, it is cheap, and it is also
generally treated as untrusted because I don't hold it to the same
standards I hold my highly trusted main laptop to.  For instance, it
doesn't have credentials to send emails.

Is it possible to copy what I need for the tests (using 'nix copy'
or 'nix-copy-closure' perhaps?) and skip them locally?  Can I run
the tests that do not need KVM while still running the rest?  This
is probably simple for anyone familiar with Nix, but that is not
me.
-- 
Sincerely,
Demi Marie Obenour (she/her/hers)

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