Update release pipeline to use workspaces and results

[AlanGreene]

Remove use of PipelineResources, switching to Tasks with workspaces and results instead.

See tektoncd/pipeline and tektoncd/operator release pipelines for example.

It may also make sense to adopt some of the other improvements to the release pipeline such as using crane cp instead of gcloud images add-tag.

Also see https://github.com/tektoncd/triggers/pull/1000

[AlanGreene]

Also need to update template for nightly release: https://github.com/tektoncd/plumbing/blob/2c1808d75b38d6fcaae0a37f5a9dda50545af4c8/tekton/resources/nightly-release/overlays/dashboard/template.yaml

See Pipelines / Triggers equivalent for reference.

[nikhil-thomas]

/assign

[AlanGreene]

/unassign

[AlanGreene]

Hey @nikhil-thomas, have you had a chance to look at updating the Dashboard release pipeline yet? No worries if you haven't, I was just wondering if you had run into any problems or had any questions about it.

[nikhil-thomas]

hi, i haven't started on it yet. I shall definitely pick it up this week. 🧑‍💻 👍

[tekton-robot]

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/lifecycle stale

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[AlanGreene]

This is done. Nightly releases are successfully using the new pipeline and are signed with Chains 🎉

The v0.22 release (due next week) will also use this new pipeline and be signed.