[release-4.8] ci: Work around git checkout security check

[openshift-cherrypick-robot]

This is an automated cherry-pick of #835

/assign travier

[openshift-ci]

@openshift-cherrypick-robot: 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/build-test-qemu	c47d9e6	link	true	/test build-test-qemu

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[ravanelli]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: openshift-cherrypick-robot, ravanelli
Once this PR has been reviewed and has the lgtm label, please assign dustymabe for approval by writing /assign @dustymabe in a comment. For more information see:The Kubernetes Code Review Process.

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[travier]

/close

[travier]

/close

[openshift-ci]

@travier: Closed this PR.

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In response to this:

/close

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 kubernetes/test-infra repository.