hydrogen: some minor tweaks for the build to work

nix/configurations/hydrogen/nixos/connectivity.nix

@@ -62,8 +62,15 @@
           };
         in
           lib.mkMerge (map go ns);
+
+        allowList = builtins.filter (x: x.ssid == "~");
       in
-        fromList (import ../../../connectivity/networks.nix);
+        fromList (
+          # We only want to use my own network
+          allowList (
+            import ../../../connectivity/networks.nix
+          )
+        );
     };
   };