Support for an image pull secret in the NFS Server pods

[g-linville]

Describe the problem/challenge you have

I want to pull the NFS Server container image from a private container registry, but cannot do it because the image pull secret used by the provisioner is not passed along to the NFS servers it creates.

Describe the solution you'd like

I would like an additional value in the Helm chart which allows me to specify an image pull secret to be used by the NFS servers, so that the NFS servers in Kubernetes can use container images that are from a private registry.

Anything else you would like to add:

I will begin working on this myself, but thought I should document it here.

Environment:

• OpenEBS version (use kubectl get po -n openebs --show-labels): 0.7.1
• Kubernetes version (use kubectl version): 1.21.4
• Cloud provider or hardware configuration: local k3d
• OS (e.g: cat /etc/os-release): Pop!_OS 21.04
• kernel (e.g: uname -a): 5.13.0-7614-generic

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