Gentoo now offers qcow2 disk images

The Gentoo Linux project has
announced
the availability of qcow2 images for amd64 (x86_64) and arm64
(aarch64), and plans to 'eventually' offer images for the
riscv64 and loongarch64 architectures.

The images, updated weekly, include an EFI boot partition and a fully
functional Gentoo installation; either with no network activated but a
password-less root login on the console ('no root pw'), or with
network activated, all accounts initially locked, but cloud-init
running on boot ('cloud-init').