Allow Selfsigned SSL Certs

[Rustypredator]

I'm using Coolify in a local Network.
This comes with the challenge, that i cant use Letsencrypt for SSL certs.

I don't know about Traefik, but Caddy allows self-signed certs on a per-service-basis
using the tls internal directive.

The Docker container that is used in Coolify allows this too.
All that is needed is the following label: caddy_0.tls=internal

While that works perfectly for me, it would nice to just have a checkbox somewhere
to set that label automatically.

While as i said i dont know how to do the same thing in traefik,
switching the proxy to caddy and using this label may be at least a
temporary fix for this discussion: #3581