hookdeliveryforwarder is currently in a Proof-of-Concept phase, not complete, and not supported.
That being said, we are likely accept bug reports with concrete reproduction steps, but usage/support issues.
To use this, you need to write some Kubernetes manifest and a container image for deployment.
For other information, please see the original pull request introduced it.
https://github.com/actions/actions-runner-controller/pull/682