An immortal pod. So you can bash into it to do anything.

immortal_pod.yaml

apiVersion: v1
kind: Pod
metadata:
  name: bash-pod
  namespace: 
spec:
  containers:
  - name: bash-container
    image: ubuntu:latest
    command: ["/bin/bash", "-c", "while true; do sleep 30; done;"]
    volumeMounts:
    - mountPath: /mnt/data
      name: 
  volumes:
  - name: 
    persistentVolumeClaim:
      claimName: claimName
  restartPolicy: Never