Move the Dashboard nightly image to GHCR

[AlanGreene]

Changes

Related to https://github.com/tektoncd/plumbing/issues/2157 and https://github.com/tektoncd/dashboard/pull/3634

Publish the Dashboard nightly release image to ghcr.io

Old images were at: gcr.io/tekton-nightly/github.com/tektoncd/dashboard/cmd/<image-name>

With this change they will now be at: ghcr.io/tektoncd/dashboard/<image-name>

/kind misc

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• [ ] Includes docs (if user facing)
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[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

[AlanGreene]

Triggered a nightly run and verified the resulting image locally: https://github.com/tektoncd/dashboard/pkgs/container/dashboard%2Fdashboard-9623576a202fe86c8b7d1bc489905f86

All tests passing 🎉

[afrittoli]

/approve /lgtm

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: afrittoli

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