nginx_dynamic_ssl.conf

server {
        listen 80 default_server;
        server_name _;

        location = /health-check {
                return 200;
                access_log off;
        }

        location / {
                return 301 https://$host$request_uri;
        }
}

server {
        listen 443 ssl;
        server_name _;

        ssl_certificate /etc/nginx/ssl/$ssl_server_name/cert.pem;
        ssl_certificate_key /etc/nginx/ssl/$ssl_server_name/cert.key;

        location / {
                proxy_pass http://s3.../;
        }
}