Add Environment Variable for external SSH Port.
Description
When installing via Docker there doesnt appear to be any ENV VAR for SSH Port. Our docker is setup with proxied ports so my SSH Port is 22 on the container and 10000 on the public network, this is remedied by editing the /etc/gitlab/gitlab.rb file to display the correct port in the UI. It would be handy if this could be set in an environment variable for easy setting.
Proposal
Add an environment variable for PROXY_SSH_PORT or similar.
Links / references
none