Semaphore Users - Github Public Keys

[herlit]

Hi,
I'm trying to provide several github repositories to different areas in my company. The thing is that github doesn't allow to share public keys from one repository to the next. So I can only use one public key(semaphore's user key) to configure it on github.
My question would be is it possible to run semaphore tasks under different users(multiple users(I need three profiles)other than the semaphore user) so I can use their public keys on github?
Thanks
Herlit