reNixos/s0meMiniPC-nix/users/users/root.nix

{...}: {
    users = {
        users = {
            root = {
                initialHashedPassword = "$6$n4OLMvYHHStHvtmr$6OL0NV1dEM2b6oJRewkhuoFxM80lI67tfbJ6QkCg8WAA1gbeKrcwDAuJjm8zvpY4zcDR3Z5Zbo8uebfOi6XXF0";
            };
        };
    };
}