OCPBUGS-56685: Skip SigstoreImageVerification skip test on ipv6 platform

[QiWang19]

It seems images should follow this https://github.com/openshift/origin/tree/main/test/extended/util/image#to-add-a-new-image so the openshift-test binary can generate a file that is used by oc image mirror for a disconnected environment.
But the example file does not include the signature .sig tag entry for mirroring, and oc image mirror does not copy the signature when only specifying the image.

[openshift-ci]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[openshift-ci-robot]

@QiWang19: This pull request references Jira Issue OCPBUGS-56685, which is invalid:

• expected the bug to target the "4.20.0" version, but no target version was set

Comment /jira refresh to re-evaluate validity if changes to the Jira bug are made, or edit the title of this pull request to link to a different bug.

The bug has been updated to refer to the pull request using the external bug tracker.

In response to this:

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the openshift-eng/jira-lifecycle-plugin repository.

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[QiWang19]

/payload-job

[openshift-ci]

@QiWang19: it appears that you have attempted to use some version of the payload command, but your comment was incorrectly formatted and cannot be acted upon. See the docs for usage info.

[QiWang19]

/payload-job e2e-metal-ipi-ovn-ipv6-techpreview

[openshift-ci]

@QiWang19: trigger 0 job(s) for the /payload-(with-prs|job|aggregate|job-with-prs|aggregate-with-prs) command

[QiWang19]

/payload-job periodic-ci-openshift-release-master-nightly-4.20-e2e-metal-ipi-serial-ovn-ipv6-techpreview

[openshift-ci]

@QiWang19: trigger 1 job(s) for the /payload-(with-prs|job|aggregate|job-with-prs|aggregate-with-prs) command

• periodic-ci-openshift-release-master-nightly-4.20-e2e-metal-ipi-serial-ovn-ipv6-techpreview

See details on https://pr-payload-tests.ci.openshift.org/runs/ci/b0fe8a40-55f7-11f0-9d4a-a6a665890cf0-0