Auto-install knative broker by trigger annotation

[nicolaferraro]

Present here: https://knative.dev/docs/eventing/channel-based-broker/

We can install the broker when a user refers to an endpoint like knative:event/name.

We couldn't do it previously because the annotation was expected to be set in the namespace, and that requires additional permissions. But the annotation on the trigger is ok.

[claudio4j]

The channel-based-broker link gives 404. I think is the right doc, to install the broker when the annotation is set in the trigger. https://knative.dev/docs/eventing/broker/triggers/#trigger-annotations

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[squakez]

Should we keep this open? cc @claudio4j @christophd

[claudio4j]

I would say yes, as the trigger annotations may be set in he CreateTrigger function, this way the knative sugar controller takes care of it.

[gansheer]

Updated link for trigger annotations doc .