Set 'logrotate' for 'nginx' logs (#2111)

* Update Dockerfile

Install 'logrotate' for nginx log. Issue https://github.com/laradock/laradock/issues/1357

* Create nginx

Create 'logrotate' file for nginx log. Issue https://github.com/laradock/laradock/issues/1357

* Update Dockerfile

Copy 'logrotate' config file. Issue https://github.com/laradock/laradock/issues/1357

* Update nginx

Add 'nodateext' logrotate option to archive with sequence number

* Update startup.sh

Add line to start 'crond' demon

* Update nginx

Update permissions

nginx/logrotate/nginx

@@ -0,0 +1,14 @@
+/var/log/nginx/*.log {
+        daily
+        missingok
+        rotate 32
+        compress
+        delaycompress
+        nodateext
+        notifempty
+        create 644 www-data root
+        sharedscripts
+        postrotate
+                [ -f /var/run/nginx.pid ] && kill -USR1 `cat /var/run/nginx.pid`
+        endscript
+}