chore(flink): allow image config

Author: jianxiaoguo

addons/flink/1.17/meta.yaml

@@ -15,6 +15,9 @@ instances_retrievable: true
 bindings_retrievable: true
 plan_updateable: true
 allow_parameters:
+- name: "image"
+  required: false
+  description: "image config for values.yaml"
 - name: "jobmanager.nodeSelector"
   required: false
   description: "jobmanager nodeSelector config for values.yaml"