create multi-arch Wait Custom Task Controller image

[Basavaraju-G]

Changes

TestWaitCustomTask_V1Beta1_PipelineRun tests are failing on s390x/ppc64le nodes due to missing multi-arch image of wait-task controller image. So add multi-arch support for test image while running the testcase.

Submitter Checklist

As the author of this PR, please check off the items in this checklist:

• 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

[Basavaraju-G]

/kind misc

[Basavaraju-G]

/assign @afrittoli

[afrittoli]

/approve

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[jerop]

/lgtm