Enable prow postsubmit jobs

[ivanvc]

What would you like to be added?

After the prow migration, we deleted the CI checks against the main branch. We should restore some of the jobs as postsubmit jobs.

Refer to our current presubmit job configurations and postubmit's

• post-etcd-verify (based on pull-etcd-verify)
• post-etcd-govulncheck (based on pull-etcd-govulncheck)

Why is this needed?

To improve the code quality, and ensure the main branch doesn't have static analysis issues and vulnerabilities.

[ivanvc]

@jmhbnz, this is the issue we spoke about yesterday. I did a pass on the current presubmit jobs, and we should only enable the two listed before. Please let me know, or update the list with the ones you think should be added (or removed).

After that, we can set it as a good first issue.

[jmhbnz]

/retitle Enable prow postsubmit jobs

[jmhbnz]

Agree the two listed jobs are a great start let's focus on those for now.

[samuelbartels20]

@ivanvc Please assign me to this ticket, I will get it done

[ahrtr]

/assign @samuelbartels20

Thank you!

[samuelbartels20]

@ivanvc @ahrtr @jmhbnz Please i have raised a PR for this issue