Update verification steps for the latest Cosign #1449
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In Cosign v1.10, the
--certificate-github-workflow-repositoryoption has been added to allow verification of OIDC subject claims on certificates.Ideally, it's better to get the certificate from Rekor (
COSIGN_EXPERIMENTAL=1), but it's also safe if you can validate the certificate chain, even if downloaded individually from GitHub. We will adopt a way to download certificates individually because it is more stable.