Add the pull secrets to values file instead of hardcoding it into deployment template

[msafwankarim]

Problem

I'm using helmify to generate chart from my Kustomize manfiests. I've defined pull secrets in kustomize manfiests but when I generate the chart it hardcodes those secrets into deployment.yaml. -image-pull-secret flag only works when imagePullSecrets are not defined in source manifests.

Desired behavior

If imagePullSecrets are defined they should be added into values.yaml file instead of hardcoding them into deployment spec. This will let the user override the imagePullSecrets while having some default value

Please let me know if this makes sense. I can work on this if it is something you want to include in the project.