Как включить редирект на https в nginx?

/etc/nginx/conf.d/site.ru.conf

server {

    listen   80;

    listen   443 ssl;

    server_name www.site.ru site.ru;

    ssl_certificate     /etc/letsencrypt/live/site.ru/fullchain.pem;

    ssl_certificate_key /etc/letsencrypt/live/site.ru/privkey.pem;



    access_log /var/www/site.ru/logs/nginx-access.log;

    error_log /var/www/site.ru/logs/nginx-error.log;



    location / {

  proxy_pass  http://127.0.0.1:81;

  include     /etc/nginx/proxy.conf;

    }



    location ~* \.(jpg|jpeg|gif|png|ico|css|bmp|swf|js)$ {

  root /var/www/site.ru/public;

      access_log off;

      expires 10d;

    }



    location /phpmyadmin {

         root /usr/share/;

         index index.php index.html index.htm;

         location ~ ^/phpmyadmin/(.+\.php)$ {

            try_files $uri =404;

            root /usr/share/;

      proxy_pass  http://127.0.0.1:81;

            fastcgi_index index.php;

            fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;

            include /etc/nginx/fastcgi_params;

         }



         location ~* ^/phpmyadmin/(.+\.(jpg|jpeg|gif|css|png|js|ico|html|xml|txt))$ {

            root /usr/share/;

         }

    }



    location /phpMyAdmin {

         rewrite ^/* /phpmyadmin last;

    }



}