Release on latest tekton

[afrittoli]

Changes

Change the release pipeline so that it runs on the latest version
of Tekton. We can now run manual releases from the dogfooding
cluster so there's no reason to keep compatibility to old version
of Tekton.

Submitter Checklist

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

• Includes tests (if functionality changed/added)
• Includes docs (if user facing)
• Commit messages follow commit message best practices

See the contribution guide for more details.

Double check this list of stuff that's easy to miss:

• If you are adding a new binary/image to the cmd dir, please update
  the release Task to build and release this image.

Reviewer Notes

If API changes are included, additive changes must be approved by at least two OWNERS and backwards incompatible changes must be approved by more than 50% of the OWNERS, and they must first be added in a backwards compatible way.

Release Notes

Describe any user facing changes here, or delete this block.

Examples of user facing changes:
- API changes
- Bug fixes
- Any changes in behavior

[afrittoli]

/hold

[afrittoli]

I'm still testing this in the dogfooding cluster.

[vdemeester]

/lgtm

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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[afrittoli]

I tested this using the staging bucket and the staging namespace on gcr.io, and it worked fine. Here are the logs for the pipelinerun pipeline-release-run-cjxzk, which was started with:

export VERSION_TAG=v0.8.0alpha
export IMAGE_REGISTRY=gcr.io/tekton-releases/staging
tkn pipeline start --param=versionTag=${VERSION_TAG} --param=imageRegistry=${IMAGE_REGISTRY} --serviceaccount=release-right-meow         --resource=source-repo=tekton-pipelines-git         --resource=bucket=tekton-bucket         --resource=builtBaseImage=base-image         --resource=builtEntrypointImage=entrypoint-image         --resource=builtKubeconfigWriterImage=kubeconfigwriter-image         --resource=builtCredsInitImage=creds-init-image         --resource=builtGitInitImage=git-init-image         --resource=builtNopImage=nop-image         --resource=builtBashImage=bash-image         --resource=builtGsutilImage=gsutil-image         --resource=builtControllerImage=controller-image         --resource=builtWebhookImage=webhook-image         --resource=builtDigestExporterImage=digest-exporter-image         --resource=builtPullRequestInitImage=pull-request-init-image                 --resource=builtGcsFetcherImage=gcs-fetcher-image         pipeline-release

[afrittoli]

/hold cancel