Remove creds-init image from release/nightly pipelines

[vdemeester]

Changes

The creds-init image is no more, so we can remove it from the images
that are built during the release (nightly or official).

Signed-off-by: Vincent Demeester vdemeest@redhat.com

/cc @sbwsg @afrittoli

/kind misc

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Release Notes

NONE

[afrittoli]

Thank you!
If we wanted at some point to make a v0.19.x or earlier minor release, we may need the old version of the pipeline, but I think this can be solved by pulling the version of the pipeline from the branch.
If future, we might want to keep tagged version of these into a registry, so we can run the correct version just by changing the bundle version.
/approve

[ghost]

I am disappointed that my grep-fu did not catch these when I removed the source last week. 😅

/approve

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: afrittoli, sbwsg

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[ghost]

/test pull-tekton-pipeline-integration-tests

[vdemeester]

tekton-pipelines   2m42s       Warning   InspectFailed                  pod/tekton-pipelines-webhook-5b7cd8c956-7x8v5                        Failed to apply default image tag "ko://github.com/tektoncd/pipeline/cmd/webhook": couldn't parse image reference "ko://github.com/tektoncd/pipeline/cmd/webhook": invalid reference format

Oh... tektoncd/plumbing#675 is really needed 😬

[afrittoli]

/test pull-tekton-pipeline-integration-tests

[afrittoli]

/lgtm