Connect staging with github app to receive webhooks

Currently we don't have any data on the heroku staging site because our github app webhook url is targeted on our ngrok url for localhost.

@SimonLab informs me that for the dwylbot github app he created 'dwylbot' as a new github user and then pointed the app created on the 'dwylbot' account to the staging url.

I can think of a couple of options to set up staging with data:
- We could create a new account as @SimonLab did before specifically for gh-backup
- or we could create a generic 'dwyl' account that we can use for future instances like this so that we don't have to create a new account each time
- or we could set this app up on dwylbot (or change the name of the dwylbot user if that's possible? but then would messages no longer appear as if they were written by 'dwylbot'?)
- or we could create a second github app on my account and point that one at staging

@nelsonic - do you have any thoughts on this?