// +optional
  optional int32 defaultMode = 3;

  // optional specify whether the ConfigMap or its keys must be defined
  // +optional
  optional bool optional = 4;
}

// A single application container that you want to run within a pod.
message Container {
  // Name of the container specified as a DNS_LABEL.
  // Each container in a pod must have a unique name (DNS_LABEL).
  // Cannot be updated.