fix: recover from panic in IsMinikubeKubernetes when kubeconfig extensions are plain strings

Some tools (e.g. Teleport) write kubeconfig cluster extensions as raw
YAML strings rather than structured objects. When devspace calls
runtime.DefaultUnstructuredConverter.ToUnstructured() on such an
extension, the k8s apimachinery reflection layer panics instead of
returning an error:

  panic: reflect.Set: value of type string is not assignable to
         type map[string]interface {}

Extract the per-extension check into a helper (isMinikubeExtension)
that uses recover() to catch the panic and treat unparseable extensions
as non-minikube, allowing the build to proceed normally.

Author: benmosher

pkg/devspace/kubectl/util.go

@@ -255,20 +255,37 @@ func IsMinikubeKubernetes(kubeClient Client) bool {
 	if rawConfig, err := kubeClient.ClientConfig().RawConfig(); err == nil {
 		clusters := rawConfig.Clusters[rawConfig.Contexts[rawConfig.CurrentContext].Cluster]
 		for _, extension := range clusters.Extensions {
-			ext, err := runtime.DefaultUnstructuredConverter.ToUnstructured(extension)
-			if err == nil {
-				if provider, ok := ext["provider"].(string); ok {
-					if provider == minikubeProvider {
-						return true
-					}
-				}
+			if isMinikubeExtension(extension) {
+				return true
 			}
 		}
 	}
 
 	return false
 }
 
+// isMinikubeExtension safely checks whether a kubeconfig cluster extension
+// identifies the cluster as a minikube provider.
+//
+// Some tools (e.g. Teleport) write extension values as plain YAML strings
+// rather than structured objects. runtime.DefaultUnstructuredConverter.ToUnstructured
+// panics on such values via reflection ("reflect.Set: value of type string is
+// not assignable to type map[string]interface {}") rather than returning an
+// error, so we recover() and treat unparseable extensions as non-minikube.
+func isMinikubeExtension(extension runtime.Object) (result bool) {
+	defer func() {
+		if recover() != nil {
+			result = false
+		}
+	}()
+	ext, err := runtime.DefaultUnstructuredConverter.ToUnstructured(extension)
+	if err != nil {
+		return false
+	}
+	provider, ok := ext["provider"].(string)
+	return ok && provider == minikubeProvider
+}
+
 // GetKindContext returns the kind cluster name
 func GetKindContext(context string) string {
 	if !strings.HasPrefix(context, "kind-") {