Feature: <control-plane> Helm External imagePullSecrets

[andrew-aiken]

Use an existing secret for the imagePullSecrets instead of the one created by the helm chart.
Don't want to have the username/password defined in Helm which is usually defined with IaC.

Current Solution

podTemplate:
  merge:
    spec:
      imagePullSecrets:
        - name: synadia-registry-secrets