Wrong default value for PVC's accessMode.

[Artebomba]

Here in pvc.yaml spec.accessMode is set to {{ default .Values.persistence.accessMode "ReadWriteOnce" }} .
Accordingly to the Helm doc for the default func, the needed correct forms are:

• {{ default "ReadWriteOnce" .Values.persistence.accessMode }}
• {{ .Values.persistence.accessMode | default "ReadWriteOnce" }}

The current value is incorrect because even if I specify

persistence:
  enabled: true
  path: /storage/inbucket
  size: 1059Mi
  className: manual-nfs
  accessMode: ReadWriteMany

the outcome still will be:

+ spec:
+   accessModes:
+     - ReadWriteOnce

because it always evaluetes "ReadWriteOnce" as a given value, not a default one.

Also it would be great to add a possibility to specify "selectors" for PVs to match like:

  selector:
    matchExpressions:
      - key: type
        operator: In
        values: [ "foo" ]
      - key: app
        operator: In
        values: [ "bar" ]

Documentations for PVC selectors https://kubernetes.io/docs/concepts/storage/persistent-volumes/#selector