need prepare /var/run/nginx directory

[peerasan]

If nginx.conf not specify PID file
pid /var/run/nginx.pid;

nginx will create file nginx.pid at /var/run/nginx/, but it will error since the directory is not found.

Solutions - create default /var/run/nginx directory.

RUN mkdir -p /apps; \
	mkdir -p /var/run/php; \
	mkdir -p /var/log/php7; \
        mkdir -p /var/run/nginx; \
	chown -Rf nginx:nginx /apps