Add saffronfox to the wireguard configuration

configuration.nix

@@ -115,6 +115,10 @@
           publicKey = "mF6eLG4VgwVV56PGn+Omg0mvN2UGB8b0i7rq8rJI+l0=";
           allowedIPs = [ "10.100.0.11/32" ];
         }
+        { # saff
+          publicKey = [ "rNnRfKSO2/M+Lf1K4y1EwKD5v40T31NpcFCliZdqADM=" ];
+          allowedIPs = [ "10.100.0.12/32" ];
+        }
       ];
     };
   };