Guix Config

(services
  
   (append (list 
   
   (service gnome-desktop-service-type)

                 ;; To configure OpenSSH, pass an 'openssh-configuration'
                 ;; record as a second argument to 'service' below.
                 (service openssh-service-type)
                 (service cups-service-type)
                 (set-xorg-configuration
                  (xorg-configuration (keyboard-layout keyboard-layout))))
          (modify-services %desktop-services
             (guix-service-type config => (guix-configuration
               (inherit config)
               (substitute-urls
                (append (list "https://substitutes.nonguix.org")
                  %default-substitute-urls))
               (authorized-keys
                (append (list (local-file "./signing-key.pub"))
                  %default-authorized-guix-keys)))))

           ;; This is the default list of services we
           ;; are appending to.
             %desktop-services)
  )