Dear Maintainer,

We recently noticed a failure when testing against debian-testing in the
CI for the Cockpit project.  One of our test cases attempts to create a
virtual machine image and fails with a message about cpio not being
available.

The cause appears to be that virt-install requires cpio (it shells out
to it from /usr/share/virt-manager/virtinst/install/installerinject.py)
but the package doesn't list it as a dependency (or even a recommends).