Fix kubernetes config not in worker config schema

Failure:
  * https://capi.ci.cf-app.com/teams/main/pipelines/capi/jobs/elsa-HA/builds/2248
  * "kubernetes.host_url" is not a valid config key

[#171900207]

Authored-by: Aakash Shah <ashah@pivotal.io>

Author: Aakash Shah

lib/cloud_controller/config_schemas/worker_schema.rb

@@ -167,6 +167,18 @@ class WorkerSchema < VCAP::Config
             url: String,
             opi_staging: bool,
           },
+          optional(:kubernetes) => {
+            host_url: String,
+            service_account: {
+              token_file: String,
+            },
+            ca_file: String,
+            optional(:kpack) => {
+              builder_namespace: String,
+              registry_service_account_name: String,
+              registry_tag_base: String,
+            }
+          },
 
           allow_app_ssh_access: bool,