Update controllers and go modules

- update source-controller to v0.0.5
- update kustomize-controller to v0.0.4
- update notification-controller to v0.0.4
- update helm-controller to v0.0.1-alpha.2

cmd/tk/bootstrap.go

@@ -141,7 +141,6 @@ func generateSyncManifests(url, name, namespace, targetPath, tmpDir string, inte
 	}
 
 	gvk = kustomizev1.GroupVersion.WithKind("Kustomization")
-	emptyAPIGroup := ""
 	kustomization := kustomizev1.Kustomization{
 		TypeMeta: metav1.TypeMeta{
 			Kind:       gvk.Kind,
@@ -157,10 +156,9 @@ func generateSyncManifests(url, name, namespace, targetPath, tmpDir string, inte
 			},
 			Path:  fmt.Sprintf("./%s", strings.TrimPrefix(targetPath, "./")),
 			Prune: true,
-			SourceRef: corev1.TypedLocalObjectReference{
-				APIGroup: &emptyAPIGroup,
-				Kind:     "GitRepository",
-				Name:     name,
+			SourceRef: kustomizev1.CrossNamespaceObjectReference{
+				Kind: sourcev1.GitRepositoryKind,
+				Name: name,
 			},
 		},
 	}

cmd/tk/create_kustomization.go

@@ -125,7 +125,6 @@ func createKsCmdRun(cmd *cobra.Command, args []string) error {
 		logger.Generatef("generating kustomization")
 	}
 
-	emptyAPIGroup := ""
 	kustomization := kustomizev1.Kustomization{
 		ObjectMeta: metav1.ObjectMeta{
 			Name:      name,
@@ -138,10 +137,9 @@ func createKsCmdRun(cmd *cobra.Command, args []string) error {
 			},
 			Path:  ksPath,
 			Prune: ksPrune,
-			SourceRef: corev1.TypedLocalObjectReference{
-				APIGroup: &emptyAPIGroup,
-				Kind:     "GitRepository",
-				Name:     ksSource,
+			SourceRef: kustomizev1.CrossNamespaceObjectReference{
+				Kind: sourcev1.GitRepositoryKind,
+				Name: ksSource,
 			},
 			Suspend:    false,
 			Validation: ksValidate,