Exposing Gitlab (with builtin container registry) on nginx (linuxserver.io swag image)

docker-compose.yml

version: '3.4'

services:
  gitlab:
    image: gitlab/gitlab-ee:latest
    restart: always
    container_name: gitlab
    environment:
      TZ: Europa/Berlin
      GITLAB_OMNIBUS_CONFIG: |
        external_url 'https://git.example.com'
        gitlab_rails['gitlab_shell_ssh_port'] = 2022
        # Docker registry
        registry_external_url 'https://registry.example.com'
        registry_nginx['ssl_certificate'] = "/etc/letsencrypt/live/example.com/fullchain.pem"
        registry_nginx['ssl_certificate_key'] = "/etc/letsencrypt/live/example.com/privkey.pem"
        registry_nginx['listen_port'] = 5050
        registry_nginx['listen_https'] = true
        # Add any other gitlab.rb configuration here, each on its own line
    expose:
      - 5050  # container registry
    ports:
      - '2022:22' # SSH git access
    volumes:
      - ./config:/etc/gitlab
      - ./logs:/var/log/gitlab
      - ./data:/var/opt/gitlab
      - ./letsencrypt:/etc/letsencrypt:ro # symlink to SWAG letsencrypt folder
    networks:
      - reverse-proxy

networks:
  reverse-proxy:  # To connect with reverse proxy
    external: true

gitlab.subdomain.conf

# make sure that your dns has a cname set for gitlab and that your gitlab container is not using a base url

server {
    listen 443 ssl;
    listen [::]:443 ssl;

    server_name git.*;

    include /config/nginx/ssl.conf;

    client_max_body_size 0;

    # enable for ldap auth, fill in ldap details in ldap.conf
    #include /config/nginx/ldap.conf;

    # enable for Authelia
    # include /config/nginx/authelia-server.conf;

    location / {
        # enable the next two lines for http auth
        #auth_basic "Restricted";
        #auth_basic_user_file /config/nginx/.htpasswd;

        # enable the next two lines for ldap auth
        #auth_request /auth;
        #error_page 401 =200 /ldaplogin;

        # enable for Authelia
        # include /config/nginx/authelia-location.conf;

        include /config/nginx/proxy.conf;
        resolver 127.0.0.11 valid=30s;
        set $upstream_app gitlab;
        set $upstream_port 443;
        set $upstream_proto https;
        proxy_pass $upstream_proto://$upstream_app:$upstream_port;
    }
}

gitlab_registry.subdomain.conf

# make sure that your dns has a cname set for gitlab and that your gitlab container is not using a base url

server {
    listen 443 ssl;
    listen [::]:443 ssl;

    server_name registry.*;

    include /config/nginx/ssl.conf;

    client_max_body_size 0;

    # enable for ldap auth, fill in ldap details in ldap.conf
    #include /config/nginx/ldap.conf;

    # enable for Authelia
    # include /config/nginx/authelia-server.conf;

    location / {
        # enable the next two lines for http auth
        #auth_basic "Restricted";
        #auth_basic_user_file /config/nginx/.htpasswd;

        # enable the next two lines for ldap auth
        #auth_request /auth;
        #error_page 401 =200 /ldaplogin;

        # enable for Authelia
        # include /config/nginx/authelia-location.conf;

        include /config/nginx/proxy.conf;
        resolver 127.0.0.11 valid=30s;
        set $upstream_app gitlab;
        set $upstream_port 5050;
        set $upstream_proto https;
        proxy_pass $upstream_proto://$upstream_app:$upstream_port;
    }
}

Thanks a lot. what are all those included config files like

include /config/nginx/proxy.conf;

where can I find them? are they needed?

This config was created to be used paired with the linuxserver swag image: https://github.com/linuxserver/docker-swag but should work in other setups to. E.g. here is the proxy.conf