Simply the path for the base image

[afrittoli]

Changes

In the publish task, if the org/repo part is already in the container registry path, do not add it again for the base image.

Submitter Checklist

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• Has Docs if any changes are user facing, including updates to minimum requirements e.g. Kubernetes version bumps
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Release Notes

NONE

/kind misc

[afrittoli]

/retest-required

[tekton-robot]

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[dibyom]

/lgtm

[vdemeester]

/retest