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”).