Use real webserver name

... we'll need this later for the TLS cert.

morph/lib/customize-monitoring.nix

@@ -59,5 +59,7 @@
     inherit paymentExporterTargets;
   };
 
+  services.private-storage.monitoring.grafana.domain = "${config.networking.hostName}.${config.networking.domain}";
+
   system.stateVersion = stateVersion;
 }

morph/lib/monitoring.nix

@@ -30,7 +30,6 @@ rec {
   ];
 
   services.private-storage.monitoring.grafana = {
-    domain = "monitoring.private.storage";
     prometheusUrl = "http://localhost:9090/";
     lokiUrl = "http://localhost:3100/";
   };