create start-up script for migration

docker/php/startup.sh

@@ -0,0 +1,13 @@
+#!/bin/sh
+
+
+#migrate DB
+cd /var/www/html/api-wiaas
+while ! mysqladmin ping -h"db" --silent; do
+    sleep 1
+done
+echo "Ready...."
+vendor/bin/phinx migrate -e development
+
+#start image
+exec apache2-foreground