What is the proper way to earth aluminium profile frames?
Bore a hole slightly smaller than the screw, use a self-tapping screw, connect earthing cable to screw with cable lug.

Alternatively: there's ready-to-use slide-in terminals for exactly that purpose: https://www.youtube.com/watch?v=Abi-TyDWO4I

Generally, screwing up something with a spring washer that is guaranteed to penetrate the oxide layer should do the job.