Feature request: UDM Pro 3.x, nspawn-container -> Pihole + Unbound

[shaft8472]

Is your feature request related to a problem? Please describe.
I would like to be able to use unbound with my Pi-hole installation on the UDM Pro.

UDM Information

• Dream Machine Pro
• Firmware Version: 3.0.20
• Controller Version: 7.3.83

I've installed an nspawn-container using an isolated MacVLAN network (Followed this guide: https://github.com/unifi-utilities/unifios-utilities/tree/main/nspawn-container#step-2a-configure-the-container-to-use-an-isolated-macvlan-network)
and
Installed Pi-hole (followed this guide: https://github.com/unifi-utilities/unifios-utilities/blob/main/nspawn-container/examples/pihole/README.md)

Describe the solution you'd like
Here's a guide: https://github.com/unifi-utilities/unifios-utilities/tree/main/unbound
This describes how to install unbound in an older configuration or with podman. I would like for this to be updated so I can use unbound again.

Describe alternatives you've considered
The above solution creates 2 containers, which would be fine.
I've previously used https://github.com/chriscrowe/docker-pihole-unbound which has everything in one container.

I'm content with performing manual updates for both components and don't require an all-in-one solution. Being self-reliant in managing updates is important to me.

Additional context
I'm very happy with the way I have everything configured now. This would be the cream on the cake. :-)

[pedropombeiro]

@shaft8472 I upgraded to UniFiOS 3.1 this weekend, and ended up installing both Pi-Hole and Unbound/Unbound-exporter in the same nspawn container (debian-dns). You can see the changes here: pedropombeiro/udm-pro@ca4643f