instruction: Create a Dockerfile for configuration
output: ```dockerfile
  from the image inaccessible.Once you're happy to move on, delete that Pod:kubectl delete pod dapi-test-pod --now
  Add ConfigMap data to a specific path in the VolumeUse the path field to specify the desired file path for specific ConfigMap items.
  In this case, the SPECIAL_LEVEL item will be mounted in the config-volume volume at /etc/config/keys.pods/pod-configmap-volume-specific-key.yaml
  apiVersion: v1
  kind: Pod
  metadata:
   name: dapi-test-pod
  spec:
   containers:
   - name: test-container
   image: registry.k8s.io/busybox:1.27.2
   command: [ "/bin/sh","-c","cat /etc/config/keys" ]
   volumeMounts:
   - name: config-volume
   mountPath: /etc/config
   volumes:
   - name: config-volume
   configMap:
   name: special-config
   items:
   - key: SPECIAL_LEVEL
   path: keys
   restartPolicy: Never
  Create the Pod:kubectl create -f https://kubernetes.io/examples/pods/pod-configmap-volume-specific-key.yaml
  When the pod runs, the command cat /etc/config/keys produces the output below:very
  Caution:Like before, all previous files in the /etc/config/ directory will be deleted.Delete that Pod:kubectl delete pod dapi-test-pod --now
  Project keys to specific paths and file permissionsYou can project keys to specific paths. Refer to the corresponding section in the Secrets guide for the syntax.You can set POSIX permissions for keys. Refer to the corresponding section in the Secrets guide for the syntax.Optional referencesA ConfigMap reference may be marked optional. If the ConfigMap is non-existent, the mounted
  volume will be empty. If the ConfigMap exists, but the referenced key is non-existent, the path
  will be absent beneath the mount point. See Optional ConfigMaps for more
  details.Mounted ConfigMaps are updated automaticallyWhen a mounted ConfigMap is updated, the projected content is eventually updated too.
  This applies in the case where an optionally referenced ConfigMap comes into
  existence after a pod has started.Kubelet checks whether the mounted ConfigMap is fresh on every periodic sync. However,
  it uses its local TTL-based cache for getting the current value of the ConfigMap. As a
  result, the total delay
  ```