add gci to seperate goimports to three parts

Signed-off-by: wuyingjun <wuyingjun_yewu@cmss.chinamobile.com>

.golangci.yml

@@ -42,6 +42,7 @@ linters:
   - unused
   - varcheck
   # other linters supported by golangci-lint.
+  - gci
   - gocyclo
   - gosec
   - whitespace
@@ -53,6 +54,11 @@ linters-settings:
   gocyclo:
     # minimal cyclomatic complexity to report
     min-complexity: 15
+  gci:
+    sections:
+      - Standard
+      - Default
+      - Prefix(github.com/karmada-io/karmada)
 
 issues:
   # The list of ids of default excludes to include or disable. By default it's empty.
@@ -62,3 +68,12 @@ issues:
   - EXC0012
   - EXC0013
   - EXC0014
+  exclude-rules:
+    # Exclude 'cmd/agent/main.go' and 'cmd/controller-manager/controller-manager.go'
+    # because 'sigs.k8s.io/controller-runtime/pkg/metrics' package should be set before 'k8s.io/apiserver/pkg/server' .
+    - path: cmd/agent/main.go
+      linters:
+        - gci
+    - path: cmd/controller-manager/controller-manager.go
+      linters:
+        - gci

pkg/karmadactl/cmdinit/kubernetes/rbac.go

@@ -1,9 +1,9 @@
 package kubernetes
 
 import (
-	"github.com/karmada-io/karmada/pkg/karmadactl/cmdinit/utils"
-
 	rbacv1 "k8s.io/api/rbac/v1"
+
+	"github.com/karmada-io/karmada/pkg/karmadactl/cmdinit/utils"
 )
 
 // CreateControllerManagerRBAC karmada-controller-manager ClusterRole and ClusterRoleBinding