ads install script

install

+#!/bin/bash -eux
+
+MYSQL_ROOT_PASSWORD=`tr -dc A-Za-z0-9_ < /dev/urandom | head -c 20 | xargs`
+ETHERPAD_ADMIN_PASSWORD=`tr -dc A-Za-z0-9_ < /dev/urandom | head -c 20 | xargs`
+
+echo "MYSQL_ROOT_PASSWORD=${MYSQL_ROOT_PASSWORD}" > env
+echo "ETHERPAD_ADMIN_PASSWORD=${ETHERPAD_ADMIN_PASSWORD}" > env