Creating kvm test server

modules/core/system.nix

@@ -2,8 +2,6 @@
   pkgs,
   username,
   hostname,
-  modulesPath,
-  inputs,
   ...
 }:
 {
@@ -23,12 +21,14 @@
         "root"
         "${username}"
       ];
+      ## Use 24 cores during building phases
+      cores = 24;
+      max-jobs = "auto";
     };
   };
 
   networking = {
     hostName = "${hostname}";
-    networkmanager.enable = true;
     firewall.enable = true;
   };
-}
+}