Add golangci-lint workflow (#4999)

* fix lint workflow

* add golang lint

* close http response body

pkg/controller/notification/notification_controller.go

@@ -279,13 +279,13 @@ func (c *Controller) multiClusterSync(ctx context.Context, obj client.Object) er
 		return err
 	}
 
-	switch obj.(type) {
+	switch obj := obj.(type) {
 	case *v2beta1.Config:
-		return c.syncFederatedConfig(obj.(*v2beta1.Config))
+		return c.syncFederatedConfig(obj)
 	case *v2beta1.Receiver:
-		return c.syncFederatedReceiver(obj.(*v2beta1.Receiver))
+		return c.syncFederatedReceiver(obj)
 	case *corev1.Secret:
-		return c.syncFederatedSecret(obj.(*corev1.Secret))
+		return c.syncFederatedSecret(obj)
 	default:
 		klog.Errorf("unknown type for notification, %v", obj)
 		return nil

pkg/controller/notification/notification_controller_test.go

@@ -55,9 +55,6 @@ var (
 		v2beta1.AddToScheme(scheme.Scheme)
 		apis.AddToScheme(scheme.Scheme)
 
-		const timeout = time.Second * 30
-		const interval = time.Second * 1
-
 		secret := &corev1.Secret{
 			ObjectMeta: metav1.ObjectMeta{
 				Name:      "foo",
@@ -100,6 +97,7 @@ var (
 		)
 		BeforeEach(func() {
 			k8sClient = fakek8s.NewSimpleClientset()
+			//nolint:staticcheck
 			cl = fake.NewFakeClientWithScheme(scheme.Scheme)
 			informerCacheCtx = context.TODO()
 			ksCache = &fakeCache{