fix: make port number become pointer (#1400)

* make port number become pointer

* fixed ut

* updated crd

* change to use pointer

* changed comment

Author: capri-xiyue

api/v1/inferencepool_types.go

@@ -123,7 +123,8 @@ type Extension struct {
 	// Service.
 	//
 	// +optional
-	PortNumber PortNumber `json:"portNumber,omitempty"`
+	//nolint:kubeapilinter // ignore kubeapilinter here as we want to use pointer here as 0 usually means all ports.
+	PortNumber *PortNumber `json:"portNumber,omitempty"`
 
 	// Configures how the gateway handles the case when the extension is not responsive.
 	// Defaults to failClose.

api/v1/zz_generated.deepcopy.go

@@ -104,7 +104,7 @@ func TestInferencePoolConvertTo(t *testing.T) {
 						Group:       &v1Group,
 						Kind:        v1Kind,
 						Name:        "my-epp-service",
-						PortNumber:  v1PortNumber,
+						PortNumber:  &v1PortNumber,
 						FailureMode: v1FailureMode,
 					},
 				},
@@ -239,7 +239,7 @@ func TestInferencePoolConvertFrom(t *testing.T) {
 						Group:       &v1Group,
 						Kind:        v1Kind,
 						Name:        "my-epp-service",
-						PortNumber:  v1PortNumber,
+						PortNumber:  &v1PortNumber,
 						FailureMode: v1FailureMode,
 					},
 				},