test: set readOnly flag in e2e test

Author: andyzhangx

test/e2e/dynamic_provisioning_test.go

@@ -269,6 +269,7 @@ var _ = ginkgo.Describe("[blob-csi-e2e] Dynamic Provisioning", func() {
 						VolumeMount: testsuites.VolumeMountDetails{
 							NameGenerate:      "test-volume-",
 							MountPathGenerate: "/mnt/test-",
+							ReadOnly:          true,
 						},
 						AccessModes: []v1.PersistentVolumeAccessMode{v1.ReadOnlyMany},
 					},