added forwarder for nextdns

configs/common.nix

@@ -25,6 +25,7 @@ in
         "-config" secrets.nextdnshash
         "-cache-size" "10MB"
         "-listen" "127.0.0.1:53"
+        "-forwarder" secrets.nextdnsforwarder
         "-report-client-info"
       ];
     };