I was looking for documentation on how to let my indico instance authenticate against GitHub and GitLab, but couldn’t find any tutorial (and it’s not that often that i have to set up this manually).
Eventually I succeeded, and did a write-up which I posted at the flask-multipass discussion page.
I don’t know whether there’s a better place for such documentation (https://docs.getindico.io/, https://talk.getindico.io/, ?), so I thought I’d post at least the links to my writeup.