restict velero server in linux nodes

Signed-off-by: Lyndon-Li <lyonghui@vmware.com>

pkg/install/deployment.go

@@ -331,6 +331,12 @@ func Deployment(namespace string, opts ...podTemplateOption) *appsv1.Deployment
 				Spec: corev1.PodSpec{
 					RestartPolicy:      corev1.RestartPolicyAlways,
 					ServiceAccountName: c.serviceAccountName,
+					NodeSelector: map[string]string{
+						"kubernetes.io/os": "linux",
+					},
+					OS: &corev1.PodOS{
+						Name: "linux",
+					},
 					Containers: []corev1.Container{
 						{
 							Name:            "velero",

pkg/install/deployment_test.go

@@ -99,4 +99,7 @@ func TestDeployment(t *testing.T) {
 	deploy = Deployment("velero", WithRepoMaintenanceJobConfigMap("test-repo-maintenance-config"))
 	assert.Len(t, deploy.Spec.Template.Spec.Containers[0].Args, 2)
 	assert.Equal(t, "--repo-maintenance-job-configmap=test-repo-maintenance-config", deploy.Spec.Template.Spec.Containers[0].Args[1])
+
+	assert.Equal(t, "linux", deploy.Spec.Template.Spec.NodeSelector["kubernetes.io/os"])
+	assert.Equal(t, "linux", string(deploy.Spec.Template.Spec.OS.Name))
 }