feat: make nostr host configurable

[alicecoordinator]

What does this PR do?

Makes it possible for coordinators to configure the nostr relay host.

Checklist before merging

• Install pre-commit and initialize it: pip install pre-commit, then pre-commit install. Pre-commit installs git hooks that automatically check the codebase. If pre-commit fails when you commit your changes, please fix the problems it points out.

[jerryfletcher21]

Nice!
Are you using the traditional scripts for your coordinator?
There is one other instance where you should add it, in traditional/templates/strfry.conf under relay -> bind.
And then adding the sed command in traditional/traditional-services strfry_setup as you did in nginx_setup.
Even though this will probably be used to run an external nost relay, so you will not run strfry locally.

[alicecoordinator]

Hey @jerryfletcher21. I am not using the traditional scripts.

I saw the loopback IP in strfry.conf, but I decided not to change it, because it would need to be a different value anyway. I mean, if someone wants to run the nostr relay in a different host, the bind in strfry.conf should still be 127.0.0.1, or 0.0.0.0, or some other local interface IP.

I am running my coordinator with a docker compose setup (not the one from robosats-deploy), and in my setup I had configured the nostr relay host with the hostname of the strfry container.

By the way, can you help me with the tests? It looks like they are failing in the main branch.

[KoalaSat]

this is great @alicecoordinator can you please also create a PR in https://github.com/RoboSats/robosats-deploy to be compatible with this?