default.conf

server {
    listen       80;
    server_name  localhost;

    location / {
        root   /usr/share/nginx/html;
        index  index.html index.htm;
    }

    location ~ /.well-known {
	      allow all
    }

    error_page   500 502 503 504  /50x.html;
    location = /50x.html {
        root   /usr/share/nginx/html;
    }
}

docker-compose.yml

version: '2'

services:
    nginx:
     image: nginx
     volumes:
       - ./:/etc/nginx/sites-available
       - ./root:/usr/share/nginx/html
     ports:
       - "80:80"
       - "443:443"
     restart: always

run.sh

touch docker-compose.yml
docker-compose.yml up -d
mkdir -p root
sudo letsencrypt certonly -a webroot --webroot-path=$(pwd)/root -d saiberz.com -d www.saiberz.com