Consume release pipeline images from GHCR

[AlanGreene]

Changes

https://github.com/tektoncd/plumbing/issues/2157 /kind misc

Submitter Checklist

These are the criteria that every PR should meet, please check them off as you review them:

• [ ] Has Docs included if any changes are user facing
• [ ] Has Tests included if any functionality added or changed
• [ ] Tested your changes locally (if this is a code change)
• [ ] Follows the commit message standard
• [ ] Meets the Tekton contributor standards (including functionality, content, code)
• [ ] Has a kind label. You can add a comment on this PR that contains /kind <type>. Valid types are bug, cleanup, design, documentation, feature, flake, misc, question, tep
• [ ] Release notes block below has been updated with any user-facing changes (API changes, bug fixes, changes requiring upgrade notices or deprecation warnings)
• [ ] Release notes contain the string "action required" if the change requires additional action from users switching to the new release

Release Notes

[tekton-robot]

Skipping CI for Draft Pull Request. If you want CI signal for your change, please convert it to an actual PR. You can still manually trigger a test run with /test all

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: vdemeester

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• ~~OWNERS~~ [vdemeester]

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[AlanGreene]

/retest