If you want to use Gogs with SSH and be able to pull/push with you SSH key, your SSH daemon must be properly configured to use private/public keys. Here is a sample configuration of `/etc/ssh/sshd_config` that works with Gogs:
Actually it's possible to access to the Git repositories by the `git` command over HTTP also in private mode installation. It's important to know that in this mode the repository could be ALSO getted if you don't set the repository as private in the repos settings.