nginx-acme-challenge.conf

events { worker_connections 1024; }
http {
    server {
        listen 80;
        server_name ${DOMAINS};

        location /.well-known/acme-challenge {
            proxy_pass http://letsencrypt:80;
            proxy_set_header Host            $host;
            proxy_set_header X-Forwarded-For $remote_addr;
            proxy_set_header X-Forwarded-Proto https;
        }

        location / {
            proxy_pass http://__my-app__:__my-app-port__;
        }

    }
}