How to build and push an image with Kaniko

[geriom]

Changes

A tutorial that shows how to create a Tekton Pipeline to build and push an image with Kaniko.

/closes pipelines/4556

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• [x] Includes docs (if user facing)
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[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dibyom, vdemeester

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[dibyom]

/lgtm