Turn on signing and attestation for serving

[evankanderson]

Which issue(s) this PR fixes:

Fixes #287

I think there's something in the environment overrides that caused .base.yaml to not apply for Serving, but this seems to have fixed it. I assumed we'd want any further patch releases on the existing lines to get signatures + attestations, so I updates the existing releases as well.

[upodroid]

Can you update the codegen please?

I'll comment on the security audit PR with more info on this.

[evankanderson]

Updated, sorry I missed your comment earlier.

[upodroid]

Thanks

[knative-prow]

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[knative-prow]

@evankanderson: Updated the job-config configmap in namespace default at cluster default using the following files:

• key serving-main.gen.yaml using file prow/jobs/generated/knative/serving-main.gen.yaml

In response to this:

Which issue(s) this PR fixes:

Fixes #287

I think there's something in the environment overrides that caused .base.yaml to not apply for Serving, but this seems to have fixed it. I assumed we'd want any further patch releases on the existing lines to get signatures + attestations, so I updates the existing releases as well.

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