Sounds like a good issue to start. Making allowVolumeExpansion configurable in roles/kubernetes-apps/external_provisioner/rbd_provisioner/templates/sc-rbd-provisioner.yml.j2

Actually there are several things to do:

1. add allowVolumeExpansion in sc-rbd-provisioner.yml.j2
2. change secret type from Opaque to kubernetes.io/rbd in secret-rbd-provisioner.yml.j2, for more information: https://kubernetes.io/zh/docs/concepts/storage/storage-classes/
3. use hyperkube: #5422

in fact, I use ceph-csi-rbd to enable Dynamic Persistent volume Provisioning for ceph rbd provisioner

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