Use VM runners[1] for building

Building inside a TCG accelerated qemu VM is slow and painful, but it is
the only option when running in a non-privileged container.

arch-boxes has been built inside a KVM accelerated VMs ("VM runner") for
over 11 months[2] and recently the MR[1] was merged into the
infrastructure repo. With it now being a official part of arch's
infrastructure we should switch to it and get much faster builds.

Doing some quick testing, the whole pipeline is now roughly ~29-84
minutes faster (taking between 7-9 minutes, instead of 36-93 minutes).

[1] https://gitlab.archlinux.org/archlinux/infrastructure/-/merge_requests/385
[2] https://gitlab.archlinux.org/archlinux/arch-boxes/-/commit/3bda5b26a675f241a1e0ba596dc94858839d96fc

Fix #161

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