Show the public IP to finish setup

scripts/cloudron-setup

@@ -227,7 +227,10 @@ while true; do
     sleep 10
 done
 
-echo -e "\n\n${GREEN}Visit https://<IP> and accept the self-signed certificate to finish setup.${DONE}\n"
+if ! ip=$(curl --fail --connect-timeout 2 --max-time 2 -q https://api.cloudron.io/api/v1/helper/public_ip | sed -n -e 's/.*"ip": "\(.*\)"/\1/p'); then
+    ip='<IP>'
+fi
+echo -e "\n\n${GREEN}Visit https://${ip} and accept the self-signed certificate to finish setup.${DONE}\n"
 
 if [[ "${rebootServer}" == "true" ]]; then
     systemctl stop box mysql # sometimes mysql ends up having corrupt privilege tables