The Fedora Magazine provided a new article about using the Fedora Account System (FAS) and how to use the desktop integrated Kerberos Login to have SSO enabled for all Fedora services:
https://fedoramagazine.org/getting-set-up-with-fedora-project-services/
And did you know, that the FAS works with CodiMD when you enabled the OpenID login?
Just sign into: https://<your account name>.id.fedoraproject.org 🎉
And yes, you can try it on https://demo.codimd.org