[release-4.21] CNF-21346: Add latest tag to on-push builds

[fontivan]

• Backport of CNF-21346: Add latest tag to on-push builds #609

[openshift-ci-robot]

@fontivan: This pull request references CNF-21346 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the story to target the "4.21.z" version, but no target version was set.

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In response to this:

• Backport of CNF-21346: Add latest tag to on-push builds #609

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fontivan

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[fontivan]

/cc @by2waysprojects @imiller0 @abraham2512

[abraham2512]

/lgtm