nixbld: fix routing policy for wifi

nixbld-etc-nixos/configuration.nix

@@ -144,6 +144,19 @@ in
         address = "2001:470:f891:2::";
         prefixLength = 64;
       }];
+      # same hack as above
+      ipv4.routes = [
+        {
+          address = "192.168.12.0";
+          prefixLength = 24;
+          options.table = "1";
+        }
+        {
+          address = "192.168.12.0";
+          prefixLength = 24;
+          options.table = "2";
+        }
+      ];
     };
     nat = {
       enable = true;