make password more strong

start.sh

@@ -3,7 +3,7 @@
 set -eux
 
 readonly WP="/app/code/wp --allow-root"
-readonly admin_password=$(pwgen -1)
+readonly admin_password=$(pwgen -1y 16)
 readonly admin_email=${MAIL_SMTP_USERNAME}@${MAIL_DOMAIN}
 echo "Admin password is ${admin_password} and email is ${admin_email}"