Run as non root user

[msschl]

It would be a good practise to run the container as a non root user I found this documentation on the nginx docker hub:

It is possible to run the image as a less privileged arbitrary UID/GID. This, however, requires modification of nginx configuration to use directories writeable by that specific UID/GID pair:

$ docker run -d -v $PWD/nginx.conf:/etc/nginx/nginx.conf nginx

where nginx.conf in the current directory should have the following directives re-defined:

pid        /tmp/nginx.pid;

And in the http context:

http {
    client_body_temp_path /tmp/client_temp;
    proxy_temp_path       /tmp/proxy_temp_path;
    fastcgi_temp_path     /tmp/fastcgi_temp;
    uwsgi_temp_path       /tmp/uwsgi_temp;
    scgi_temp_path        /tmp/scgi_temp;
...
}

[rolfwessels]

Can you send a pr for the change? I will happily include it.