fix: Ensure metadata access in RGD status and relocate example file

Author: SanjayUG

Diff for: examples/kubernetes/test-metadata.yaml

@@ -0,0 +1,26 @@
+// This file will be moved to examples/kubernetes/test-metadata.yaml
+
+apiVersion: kro.run/v1alpha1
+kind: ResourceGraphDefinition
+metadata:
+  name: using-metadata
+spec:
+  schema:
+    apiVersion: v1alpha1
+    kind: UsingMetadata
+    spec:
+      data:
+        foo: string
+        bar: integer
+    status:
+      created: ${configmap.metadata.creationTimestamp}
+  resources:
+    - id: configmap
+      template:
+        apiVersion: v1
+        kind: ConfigMap
+        metadata:
+          name: ${instance.metadata.name + "-cm"}
+        data:
+          foo: ${schema.spec.data.foo}
+          bar: ${string(schema.spec.data.bar)} 

Diff for: pkg/controller/resourcegraphdefinition/controller_status.go

@@ -130,6 +130,15 @@ func (r *ResourceGraphDefinitionReconciler) setResourceGraphDefinitionStatus(
 		dc.Status.TopologicalOrder = topologicalOrder
 		dc.Status.Resources = resources
 
+		// Ensure metadata fields are included in the status update
+		metadata := resourcegraphdefinition.Object["metadata"].(map[string]interface{})
+		if metadata != nil {
+			dc.Status.Resources = append(dc.Status.Resources, v1alpha1.ResourceInformation{
+				ID: "metadata",
+				Dependencies: []v1alpha1.Dependency{},
+			})
+		}
+
 		log.V(1).Info("updating resource graph definition status",
 			"state", dc.Status.State,
 			"conditions", len(dc.Status.Conditions),