Tags for Training container images

[andreyvelich]

/kind feature

Currently, we don't have any tags and version control for our images in Docker registry: docker.io/kubeflowkatib/.
Therefore, PRs for changing training containers source code (e.g #1241) affect on all examples, because we are using the latest tag.

Do you have any ideas how we can control versions of these images since we maintain them in Katib repository?
Do we want to have at least version for v1alpha3 and v1beta1.

What do you think @johnugeorge @gaocegege ?

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