You’re correct in that a special resolution would be required, as would supporting information from you about the size / location of the skylight, the contractor who’s doing the work and their workers compensation / liability insurance policy details.
The post-installation maintenance and repair of the skylight would by default fall to the Owners Corporation unless in order to avoid that, it resolves to draft and register a Special By-Law to, with your prior written consent, transfer those responsibilities to you and to all subsequent Owners of your Lot.
Payment for the costs of the Special By-Law covering the above for your Lot would normally be your responsibility, unless your Owners Corporation (O/C) anticipates receiving similar proposals from the other Owners at some future time, in which case the Special By-Law would be worded generically and be paid for by your O/C.