[3.5] Add govuln GitHub workflow

[ivanvc]

Enables govuln in the release-3.5 branch.

Part of #17549.

Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.

[k8s-ci-robot]

Hi @ivanvc. 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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[liangyuanpeng]

LGTM

[jmhbnz]

LGTM - New workflow is now correctly picking up the recent CVE affecting release-3.5.

This is a good signal to have for the stable release branches, thanks @ivanvc.

[ivanvc]

LGTM - New workflow is now correctly picking up the recent CVE affecting release-3.5.

This is a good signal to have for the stable release branches, thanks @ivanvc.

Would it make sense to also enable it as a nightly job for these branches?

[ahrtr]

Thanks for the fix.

Please rebase this PR.

Would it make sense to also enable it as a nightly job for these branches?

Adding a workflow being triggered on each PR might be good enough for now. If we all agree to do it, then let's add a nightly for main, 3.5 and 3.4.

[ahrtr]

lgtm

Thanks