nixos/tests/rabbitmq: fail quickly if service fails to start

nixos/tests/rabbitmq.nix

@@ -1,6 +1,6 @@
 # This test runs rabbitmq and checks if rabbitmq is up and running.
 
-{ pkgs, ... }:
+{ lib, pkgs, ... }:
 let
   # in real life, you would keep this out of your repo and deploy it to a safe
   # location using safe means.
@@ -40,6 +40,8 @@ in
         ].
       '';
     };
+    systemd.services.rabbitmq.serviceConfig.Restart = lib.mkForce "no";
+
     # Ensure there is sufficient extra disk space for rabbitmq to be happy
     virtualisation.diskSize = 1024;
   };