re add for test

modules/k3s/deployments/default.nix

@@ -1,7 +1,7 @@
 { cfg, lib, inputs, ... }:
 let
   manifests = [
-    
+    ./test-ubuntu.nix
   ];
   imported = map ( n: import n { inherit cfg lib inputs; } ) manifests;
 in

modules/k3s/deployments/test-ubuntu.nix

@@ -0,0 +1,15 @@
+{cfg, lib, inputs, ...}:
+{
+  test-ubuntu.content = {
+    apiVersion = "v1";
+    kind = "Pod";
+    metadata.name = "test-ubuntu";
+    spec.containers = [
+      {
+        name = "test-ubuntu";
+        image = "ubuntu:latest";
+        command = [ "tail" "-f" "/dev/null" ];
+      }
+    ];
+  };
+}