Add static unsigned artifacts image

[dsimansk]

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dsimansk

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[openshift-ci]

@dsimansk: The following tests 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/418-images	68675b6	link	true	/test 418-images
ci/prow/418-test-e2e	68675b6	link	true	/test 418-test-e2e
ci/prow/420-test-e2e	68675b6	link	true	/test 420-test-e2e
ci/prow/420-images	68675b6	link	true	/test 420-images
ci/prow/419-images	68675b6	link	true	/test 419-images
ci/prow/419-test-e2e	68675b6	link	true	/test 419-test-e2e

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