apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: piano-sheet-data
  namespace: cube-piano-sheet
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      # 图片直存 sqlite，留出宽裕空间
      storage: 10Gi
  # storageClassName 留空 → 走 k3s 默认 local-path（hostPath，单节点足够）