Configuration of gitlab to use an e-email hosted in a cPanel account. Also use SSL via Caddy

Caddyfile

:443 {
   tls internal {
       on_demand
   }

   reverse_proxy localhost:8929 {
       header_up Host {host}
       header_up X-Real-IP {remote}
       header_up X-Forwarded-For {remote}
       header_up X-Forwarded-Port {server_port}
       header_up X-Forwarded-Proto {scheme}
       health_timeout 5s
   }
}

docker_compose.yml

version: '3.6'
services:

  caddy:
    image: caddy:latest
    restart: unless-stopped
    ports:
        - '80:80'
        - '443:443'
          
    volumes:
      - './caddy/Caddyfile:/etc/caddy/Caddyfile'
      - gitcaddy:/data
      - gitcaddy:/config

    networks:        
      - gitlab_net        

  web:
    image: 'gitlab/gitlab-ee:latest'
    restart: always
    hostname: "your_domain.com"
    environment:
      GITLAB_OMNIBUS_CONFIG: |        
        external_url 'https://localhost:8929'
        GITLAB_ROOT_EMAIL="your@email.com"
        GITLAB_ROOT_PASSWORD="your_pass"
        gitlab_rails['smtp_enable'] = true
        gitlab_rails['smtp_address'] = "cpanel_domain"
        gitlab_rails['smtp_port'] = 587
        gitlab_rails['smtp_authentication'] = "plain"
        gitlab_rails['smtp_enable_starttls_auto'] = true
        gitlab_rails['smtp_user_name'] = "your@email.com"
        gitlab_rails['smtp_password'] = "pass"
        gitlab_rails['smtp_domain'] = "email.com"
        gitlab_rails['smtp_openssl_verify_mode'] = 'none'
        
        # ITS MANDATORY TO DEFINE THIS VARIABLES
        gitlab_rails['gitlab_email_from'] = 'your@email.com'
        gitlab_rails['gitlab_email_reply_to'] = 'your@email.com'

    ports:
      - '8929:8929'
      - '2224:22'            
    volumes:
      - './gitlab/config:/etc/gitlab'
      - './gitlab/logs:/var/log/gitlab'
      - './gitlab/data:/var/opt/gitlab'
    shm_size: '256m'
    networks:
      - gitlab_net

networks:
   gitlab_net:
        driver: bridge

volumes:
    gitcaddy:
        driver: local