Dockerfile for nginx and php-fpm together.
Composer is also installed for convenience.
Doc root is in
/usr/share/nginx/html so mounting files there will get them served.
This can be overridden by setting the env NGINX_ROOT in the container or when building an image from this one.
ERRORS env can be set to toggle error reporting. Check out
cmd.sh to see what happens.
ERRORS=1 will trigger error reporting, everything else keeps it turned off.