[Helm Chart][Feature] Allow Setting Custom imagePullPolicy for csi-resizer

[jyaworski]

Is your feature request related to a problem?/Why is this needed
We cache images on our worker nodes and would like to use that cache when possible. imagePullPolicy: Always doesn't allow us to do that.

/feature

Describe the solution you'd like in detail
I would like to have the ability to set the CSI Resizer imagePullPolicy.

Describe alternatives you've considered
None

Additional context
I can file a PR for this myself, if it's approved.

https://github.com/kubernetes-sigs/aws-ebs-csi-driver/blob/master/charts/aws-ebs-csi-driver/templates/controller.yaml#L215

[wongma7]

yes feel free to file a PR to remove this line, I am not sure why it is there when all the other sidecars don't specify an imagePullPolicy, the PR will be approved.

(in addition, I suppose each sidecar should have a sidecars.*.pullPolicy field. But removing this line does not preclude adding a a sidecars.*.pullPolicy field later.)