Internal Server Error while running docker-compose to install Gitlab
In the error message you presented your system is reporting port 443 is already in use. You need to confirm which ports you have in use for other services.


  listen tcp 0.0.0.0:443: bind: address already in use


For what it is worth I recommend you use a nginx reverse proxy. Please reference https://stackoverflow.com/questions/46195852/how-to-run-gitlab-in-docker-container-with-nginx-proxy-over-ssl-with-letsencrypt for further details.