I'm not sure if I understood you correctly. Delegation of authentication usually implies trust between the two parties. GitLab (the hosted version) does probably not trust stravros.io enough to allow people to log in through there.
Portier looks indeed very nice, maybe I'll set up a tutorial how to get those two working together to get full Authentication (portier) + Authorization (Hydra) with using only open source technology.
Portier looks indeed very nice, maybe I'll set up a tutorial how to get those two working together to get full Authentication (portier) + Authorization (Hydra) with using only open source technology.