Librespot needs a zeroconf backend switcher

[Drun555]

Case why it can be important: you may want to create a Spotify Connect device using MA, but your host is already have a working Avahi instance (basically, if you have a multi-purpose machine, you probably already have Avahi installed).

In case you'll try, this would happen

For example this container have a ZEROCONF_BACKEND flag which specifically address this.

It would be nice if we had a similiar flag (or even an error handler which automatically tries to switch the backend) inside Music Assistant.