supplemental_ci_images/coreos: Mirror the ostreecontainer release image

[cgwalters]

I've been pushing a test release image to the coreos/ namespace,
but that's not sufficient for it to be mirrored into the build clusters.

Now, what would be a lot cleaner is to either:

• Actually build that release image from source in api.ci on pushes
  to openshift/os, but that would require some more new novel code
• Push to some place else like quay.io and mirror it like any other
  external image, but that makes it harder to share the ability for
  other people to push without figuring out how to manually add
  everyone to a new quay.io organization, not to mention juggling
  new quay credentials

So...let's mirror inside the CI clusters.

[cgwalters]

Dependency of: #24222

[openshift-ci]

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[cgwalters]

Closing in favor of #24225