Allow and document connection from Public Github.com to private Kabanero

[tseelbach]

There are scenarios where one may want to create and use webhooks from public github.com/repo to a private Kabanero environment. What are the steps to do this?

Enterprise infrastructure owner needs to expose a public IP address / endpoint that the github webhook will connect to when commit events occur. The webhook extension needs to provide a routeable endpoint (alias) to github

RUNTIME

Public Public Private
github.com ---event----=> webhook endpoint

github.com ---event---=> webhook alias --->NAT ---> webhook endpoint

REGISTRATION

Note: not entirely sure about this flow. At a minimum, the pipeline extension will call outbound to github. Maybe there is a handshake which involves a helloworld invocation of the runtime flow? If there were no side effects than it would be sufficient as a workaround to create the webhook on github directly. An additional concern is what if any security implications would there be for allowing such a manual external registration?