Support imagePullSecrets for offline private container registries

[abdennour]

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Description

There is no direct helm way to specify imagePullSecrets

Potential Helm Configuration

global:
  imagePullSecrets:
  - nexus-secret # .i.e.

where nexus-secret (for example) is already in existing secret with dockerconfig type.

References

https://kubernetes.io/docs/concepts/containers/images/#specifying-imagepullsecrets-on-a-pod