[DRAFT][DO NOT MERGE] Prototype reading repos from external_service.config
Created by: rafax
DO NOT MERGE This prototypes adding repositories that were added by the user, but have not yet been synced to /settings/repositories view
https://user-images.githubusercontent.com/1022220/139246821-ad8dd9d4-5abd-4964-a5d9-ca1df3805f87.mov