feat: ExternalDNS

[peucastro]

it works ig

TODO

• Find a better way to handle IngressRoute discovery without the need of setting a specific target
• Delete the dev/test-external-dns service

[peucastro]

According to the documentation, when routing via Traefik IngressRoute, ExternalDNS cannot natively discover the public endpoint. This requires us to manually specify the external-dns.alpha.kubernetes.io/target pointing to the Traefik LoadBalancer external IP for all services.

This is not very convenient, so I'm researching some ways to handle this better. Feel free to edit this comment and add more options

• Migrate from IngressRoute to standard Kubernetes Ingress resources: Traefik natively populates the .status.loadBalancer field on standard Ingress objects, allowing ExternalDNS to discover the external IP automatically.
• Deploy traefik-external-dns-controller to automatically populate this value