Use GitHub organization membership for auto-provision

Description of the feature request

It would be nice if there was a way to have Bitrise automatically join members to my Organization if they log in via GitHub and that account is tied to an organization I specify from GitHub at an account level/group I pre-selected.

It would be even better if I could have the GitHub organization membership add/removals get reflected to Bitrise accounts w/o my intervention other than an initial set-up.

Use case / for what or how I would use it

This would be useful for folks who already have existing GitHub organizations to be able to manage groups easily from one place. If a new developer joins the GitHub organization, I as a Bitrise admin would prefer if they are able to login to Bitrise with their GitHub account and be auto-provisioned to say the Tester role. It would be even better if these “auto-provisioned” accounts would also de-provision if their membership with the GitHub org goes away.

This would be amazing for simplifying user management, especially for GitHub enterprise customers that use single sign-on.

Nice, Thank you for the feature request!