Offer option of an erofs nix store image

[nixos-qemu-vm-isolation] / README.md

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 Isolate NixOS QEMU VMs from each other and from the host by using a
-squashfs for the VM's /nix/store that contains only the VM's dependencies
+private /nix/store image that contains only the VM's dependencies
 (like the installer has) rather than a virtio mount of the host's entire
 /nix/store.