implement/add SRV record

We have MX record that is just for mail

SRV record is THE generalization, it's useful for VoIP, chat services, etc.

In my particular interest, SRV record is required for federation between matrix servers

[rogerpueyo]

@pedro-nonfree ,

The change you propose must also be implemented in the guifi_hosts.inc.php file of the drupal-guifi module.

Would you like to give it a try? With the Docker images available you can start contributing very quickly!