Cannot add repositories from GitHub to local instance since external services

Created by: felixfbecker

When going to http://localhost:3080/github.com/codecov/sourcegraph-codecov I get this screen:

This is a public GitHub repo, so I would expect it to "just work", at least for our dev instances (which used to be the case).

When clicking on "adding an external service" (which is almost impossible to notice as a link), I tried adding an external service for GitHub:

At first I hit the back button because I didn't realise the "Add external service" button was like a "Save" button.

After saving, I still saw the same error. I then noticed the little hint that a token was missing. Why do I need a token for public GitHub repos?

So I added a token, and now I am getting this error:

At this point I don't know what to do anymore, because being a public repository, this repo is obviously accessible with any token.