Tests are not updated for sigstore yet

[thegreyd]

Fixing tests from #609
Tests remain to be updated for that particular bit. So set skip flag, until
we update them

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[openshift-ci]

@thegreyd: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/security	a2e0858	link	false	/test security

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