Last tested: Jun 24, 2020
It's URLs to the github repository!
For example: https://github.com/<user>/<project>
You may want to use wildcard syntax so you can use multiple projects within the same org, for example
This domain also needs to be publicly accessible (per this post) It is in the docs -https://docs.looker.com/admin-options/settings/user-attributes but it is a little hard to find...
For Bitbucket, the URLs are structured like this:
You can use this syntax: