[3.5] Ensure commits are signed in scripts/release.sh

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #18592

/assign jmhbnz

[k8s-ci-robot]

Hi @k8s-infra-cherrypick-robot. Thanks for your PR.

I'm waiting for a etcd-io member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[jmhbnz]

/ok-to-test

[jmhbnz]

/retitle [3.5] Ensure commits are signed in scripts/release.sh

[jmhbnz]

/retest

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahrtr, henrybear327, k8s-infra-cherrypick-robot

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