Add support for imagePullSecrets to helm charts

[Samze]

Co-authored-by: Chris Whitty [email protected]

This PR is a

• Feature Implementation
• Bug Fix
• Documentation

What this PR does / why we need it:
This PR adds support for imagePullSecrets(ref) to all charts.

Notes:

• We have added this to value to all charts that allow you to specify image.
• We decided not to follow the pattern bitnami use, since it means creating a nesting image object and would require a breaking change to existing image values in the values.yaml.

Which issue(s) this PR fixes
Fixes #2712

Please leave this checklist in the PR comment so that maintainers can ensure a good PR.

Merge Checklist:

• New feature
  • Tests
  • Documentation
• SVCat CLI flag
• Server Flag for config
  • Chart changes
  • removing a flag by marking deprecated and hiding to avoid
    breaking the chart release and existing clients who provide a
    flag that will get an error when they try to update

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[k8s-ci-robot]

Hi @Samze. Thanks for your PR.

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[mszostok]

/ok-to-test

[mszostok]

Having a single image entry for grouping that cfg is a really nice thing but as you noticed having that feature as backward-compatible is even better at the current state, so:

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mszostok, Samze

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