Change image pull secrets to array instead of map

[mattbrandman]

#700 for reference

What was changed

Updated the imagepullsecret to an array as thats what a deployment expects

Why?

To ensure this works

Checklist

1. Closes #700
2. How was this tested:

Tested locally by using kustomize to apply a locally modified values chart that used array instead of dict 3. Any docs updates needed?

No

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