Add golangci-lint workflow (#4999)

* fix lint workflow

* add golang lint

* close http response body

pkg/controller/group/group_controller.go

@@ -27,7 +27,6 @@ import (
 	"k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/labels"
-	"k8s.io/apimachinery/pkg/runtime"
 	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
 	"k8s.io/client-go/kubernetes"
 	"k8s.io/client-go/kubernetes/scheme"
@@ -62,7 +61,6 @@ const (
 
 type Controller struct {
 	controller.BaseController
-	scheme               *runtime.Scheme
 	k8sClient            kubernetes.Interface
 	ksClient             kubesphere.Interface
 	groupInformer        iamv1alpha2informers.GroupInformer
@@ -220,7 +218,7 @@ func (c *Controller) reconcile(key string) error {
 				return item == finalizer
 			})
 
-			if group, err = c.ksClient.IamV1alpha2().Groups().Update(context.Background(), group, metav1.UpdateOptions{}); err != nil {
+			if _, err = c.ksClient.IamV1alpha2().Groups().Update(context.Background(), group, metav1.UpdateOptions{}); err != nil {
 				return err
 			}
 		}

pkg/controller/group/group_controller_test.go

@@ -44,7 +44,6 @@ import (
 )
 
 var (
-	alwaysReady        = func() bool { return true }
 	noResyncPeriodFunc = func() time.Duration { return 0 }
 )
 
@@ -152,6 +151,7 @@ func (f *fixture) run(userName string) {
 	f.runController(userName, true, false)
 }
 
+//nolint:unused
 func (f *fixture) runExpectError(userName string) {
 	f.runController(userName, true, true)
 }