Upstream now provides a solution for setting the "staging dir" for
fastzip[1].

[1] https://gitlab.com/gitlab-org/gitlab-runner/-/merge_requests/3130

For some workloads running in a container is too restrictive, ex:
arch-boxes (loop device, filesystem mount, pacstrap) and archiso
(pacstrap). Currently they both run a TCG accelerated QEMU VM, which is
very slow and painful to work with. We should provide a better option to
our users!

This adds a hardware accelerated VM for this kinds of workloads, which
is way faster and you can do whatever you like (mostly)!

Fix #283

Fix #193