fix(cli): Fix appset generate in --core mode (argoproj#20717)

Signed-off-by: OpenGuidou <guillaume.doussin@gmail.com>

cmd/argocd/commands/headless/headless.go

@@ -15,7 +15,8 @@ import (
 	"github.com/spf13/cobra"
 	"github.com/spf13/pflag"
 	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
-	"k8s.io/apimachinery/pkg/util/runtime"
+	"k8s.io/apimachinery/pkg/runtime"
+	runtimeUtil "k8s.io/apimachinery/pkg/util/runtime"
 	"k8s.io/client-go/dynamic"
 	"k8s.io/client-go/kubernetes"
 	cache2 "k8s.io/client-go/tools/cache"
@@ -202,7 +203,7 @@ func MaybeStartLocalServer(ctx context.Context, clientOpts *apiclient.ClientOpti
 	}
 
 	// get rid of logging error handler
-	runtime.ErrorHandlers = runtime.ErrorHandlers[1:]
+	runtimeUtil.ErrorHandlers = runtimeUtil.ErrorHandlers[1:]
 	cli.SetLogLevel(log.ErrorLevel.String())
 	log.SetLevel(log.ErrorLevel)
 	os.Setenv(v1alpha1.EnvVarFakeInClusterConfig, "true")
@@ -237,7 +238,14 @@ func MaybeStartLocalServer(ctx context.Context, clientOpts *apiclient.ClientOpti
 		return fmt.Errorf("error creating kubernetes dynamic clientset: %w", err)
 	}
 
-	controllerClientset, err := client.New(restConfig, client.Options{})
+	scheme := runtime.NewScheme()
+	err = v1alpha1.AddToScheme(scheme)
+	if err != nil {
+		return fmt.Errorf("error adding argo resources to scheme: %w", err)
+	}
+	controllerClientset, err := client.New(restConfig, client.Options{
+		Scheme: scheme,
+	})
 	if err != nil {
 		return fmt.Errorf("error creating kubernetes controller clientset: %w", err)
 	}