USHIFT-5288: Mirroring of images in CI should be performed for the current platform only

[ggiguash]

See the JIRA comment for performance and disk size differences when mirroring multi-platform vs single-platform images.

[openshift-ci-robot]

@ggiguash: This pull request references USHIFT-5288 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 "4.19.0" version, but no target version was set.

In response to this:

See the JIRA comment for performance and disk size differences when mirroring multi-platform vs single-platform images.

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[pacevedom]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ggiguash, pacevedom

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[openshift-ci]

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