Remove tag+digest on shell-image 🍶

[vdemeester]

Changes

Some runtime (cri-o) do not support tag+digest notation on image
reference. Removing this on shell-image to fix the notags release
yamls.

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

Fixes #2779

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• If you are adding a new binary/image to the cmd dir, please update
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Release Notes

Fix shell-image reference to not include the tag in addition to the digest in order to fix the `*.notags.yaml` release files

[tekton-robot]

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[vdemeester]

/kind bug
/milestone Pipelines 0.13 🐱

[tekton-robot]

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[vdemeester]

/cc @bobcatfish @afrittoli

[afrittoli]

/approve

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[ghost]

/lgtm