Lightweight GitLab alternative for small company

I'm looking for GitLab replacement, which does not require 4GB RAM and is easier to move/upgrade/migrate, does not have dependency hell and creates less than 50 processes on server. There are 3, sometimes 4 programmers in my company, we don't need that many features. We need just: - add/remove repository - add/edit/remove user - add/remove user SSH key - add/edit/remove group (of users) - allow user or group to read/write repository does such a thing exist or should we just use linux console?