add logrotate config

etc/logrotate.d/nginx

@@ -0,0 +1,18 @@
+/var/log/nginx/*.log {
+    daily
+    missingok
+    rotate 14
+    compress
+    delaycompress
+    notifempty
+    create 0640 www-data adm
+    sharedscripts
+    prerotate
+        if [ -d /etc/logrotate.d/httpd-prerotate ]; then \
+            run-parts /etc/logrotate.d/httpd-prerotate; \
+        fi \
+    endscript
+    postrotate
+        invoke-rc.d nginx rotate >/dev/null 2>&1
+    endscript
+}