vbump will fail to start with persistence enabled

With default config
```persistence:
  enabled: true
  accessMode: ReadWriteOnce
  size: 5Mi
```

vbump will try to create a new pod without releasing the pv before. this will result in a crashloopbackoff.

Possible quickwins:
- change resourcetype from deployment to statefulset
- change strategy to `Recreate` instead of `RollingUpdate`