Allow binding to custom IP address

[louneskmt]

Keeping in mind that it is not recommended to run Umbrel on a VPS as it is designed to be run on a secure local network, this PR allows VPS users to bind containers ports to a custom IP address (127.0.0.1 recommended) instead of 0.0.0.0 by default (which opens Umbrel's ports to the world on a VPS connected directly to internet as there is no router).

On first run, BIND_ADDRESS can be used to specify the IP address you want to bind Umbrel core services and apps ports to:

sudo BIND_ADDRESS=127.0.0.1 ./scripts/start

Afterwards, this configuration can be overwritten:

sudo BIND_ADDRESS=0.0.0.0 ./scripts/configure

Replaces #501

[lorenzoPrimi]

Is this gonna be merged? All the VPS umbrel users are waiting!

[m-nogues]

Is there a plan to merge this at some point ?