Added a custom entrypoint script and finished off the saving feature of the admin page.

entrypoint.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+set -e
+
+echo "Custom entrypoint.sh: `hostname -s`!"
+chmod -Rfv ugo+w /var/www/html/dat
+
+exec docker-php-entrypoint apache2-foreground
+