Add support for pull secret

[rbren]

What this PR does / why we need it

We're hitting docker hub rate limiting issues, and need to add a pull secret to get past them.

Which issue this PR fixes

Special notes for your reviewer

Checklist

• Chart Version bumped
• CLA signed

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[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}