PHP-FPM using unix sock instead of TCP

[kiddtang]

Is your feature request related to a problem? Please describe.
I am new in docker, but it is very easily to set PHP-FPM using unix socket in normal LEMP stack.

 location ~ \.php$ {
                include snippets/fastcgi-php.conf;
                fastcgi_pass unix:/var/run/php/php7.2-fpm.sock;
        }

also TCP is having network protocol overhead, which can affect speed and throughput.

Inspired by this article...
https://medium.com/@shrikeh/setting-up-nginx-and-php-fpm-in-docker-with-unix-sockets-6fdfbdc19f91

Describe the solution you'd like
Possible to have php-fpm with unix socket option? If i am not mistake, it is currently using the default port 9000 as the mapping shown in docker ps