Create Guix ISO for VMM

Download and verify ISO

$ ftp https://ftp.gnu.org/gnu/guix/guix-system-install-1.3.0.x86_64-linux.iso
$ ftp https://ftp.gnu.org/gnu/guix/guix-system-install-1.3.0.x86_64-linux.iso.sig

If gpg is not already installed:

$ doas pkg_add gnupg

$ gpg --keyserver keyserver.ubuntu.com --recv-keys 27D586A4F8900854329FF09F1260E46482E63562
$ gpg --verify guix-system-install-1.3.0.x86_64-linux.iso.sig guix-system-install-1.3.0.x86_64-linux.iso
gpg: Signature made Tue May 11 18:30:41 2021 CDT
gpg:                using RSA key 27D586A4F8900854329FF09F1260E46482E63562
gpg: Good signature from "Maxim Cournoyer <maxim.cournoyer@savoirfairelinux.com>" [expired]
gpg:                 aka "Maxim Cournoyer <maxim.cournoyer@gmail.com>" [expired]
gpg: Note: This key has expired!
Primary key fingerprint: 27D5 86A4 F890 0854 329F  F09F 1260 E464 82E6 3562