Add priorityClassName to helm chart

[Elegant996]

On a graceful shutdown, it's possible that the csi-driver would evict before cleaning up the csi volumes. Would it be prudent to add priorityClassName to helm chart to cover that? Clients could then choose whether they need it and set it to system-node-critical or other as needed.

[wallrj]

@Elegant996 I've been writing some documentation explaining why to set priorityClassName when deploying cert-manager and what the value should be. Please read and feedback if you have time:

• Explain why to use priorityClassName: system-cluster-critical in production website#1444

Did you have success using system-node-critical for the cert-manager csi-driver? Do other CSI drivers use or recommend that priority class too?