instruction: Create a Dockerfile for configuration
output: ```dockerfile
  from the moment when the ConfigMap is updated to the moment
  when new keys are projected to the pod can be as long as kubelet sync period (1
  minute by default) + TTL of ConfigMaps cache (1 minute by default) in kubelet. You
  can trigger an immediate refresh by updating one of the pod's annotations.Note:A container using a ConfigMap as a subPath
  volume will not receive ConfigMap updates.Understanding ConfigMaps and PodsThe ConfigMap API resource stores configuration data as key-value pairs. The data can be consumed
  in pods or provide the configurations for system components such as controllers. ConfigMap is
  similar to Secrets, but provides a means of working
  with strings that don't contain sensitive information. Users and system components alike can
  store configuration data in ConfigMap.Note:ConfigMaps should reference properties files, not replace them. Think of the ConfigMap as
  representing something similar to the Linux /etc directory and its contents. For example,
  if you create a Kubernetes Volume
  ```