Add label arg to create commands

docs/cmd/gotk_create_source_helm.md

@@ -53,6 +53,7 @@ gotk create source helm [name] [flags]
       --export              export in YAML format to stdout
       --interval duration   source sync interval (default 1m0s)
       --kubeconfig string   path to the kubeconfig file (default "~/.kube/config")
+      --label strings       set labels on the resource (can specify multiple labels with commas: label1=value1,label2=value2)
       --namespace string    the namespace scope for this operation (default "gitops-system")
       --timeout duration    timeout for this operation (default 5m0s)
       --verbose             print generated objects