nixos/tests/gotenberg: auto start chromium and libreoffice to detect failures starting them without having to convert a document

nixos/tests/gotenberg.nix

@@ -7,6 +7,9 @@
   nodes.machine = {
     services.gotenberg = {
       enable = true;
+      # fail the service if any of those does not come up
+      chromium.autoStart = true;
+      libreoffice.autoStart = true;
     };
   };