Banzai Cloud Pipeline uses Dex for its main authentication entry point. Dex is an open-source, federated OpenID Connect identity provider. It can be configured with a number of upstream identity providers. On the free, and hosted version of the Pipeline only the GitHub connector is enabled, which points to the public GitHub instance.
The Pipeline platform consumes the ID token issued by Dex. When the user authenticates for the first time through Dex, a user account gets created in Pipeline. Visit the login page in a browser: