[Feature Request]: Add ability to create a ZT "moon"

[FallenChromium]

🚀 Feature Summary

Adding an option to host a moon would allow to serve a custom root for the network without disconnecting it from the ZT default roots

📝 Detailed Description

This feature is for adding an additional L1 backbone to a zerotier network without leaving to a separate zerotier planet. It is useful for cases when some (but not all) network endpoints are isolated from a ZT root (think censorship or corporate firewalls), but other devices might benefit from connectivity to ZT central roots, such as mobile phones (connecting to a custom planet is problematic on the mobile clients). Moons (see docs) can give a great boost in connectivity throughput in firewalled environments or can be a privacy-enhancing feature without breaking the comfort of discovering a network through the default roots

🎯 Use Case

Not that much to add, I'd just like to have a custom root if my home lab will have problems with internet connectivity (I have a separate channel to a controller that is neither internet or a local network, because no multicast is allowed through this path, local peer discovery won't work). Moon is an ideal solution to this problem.

💡 Willing to Contribute

Yes, I could help with testing

[sinamics]

I created a test image you can try out.
image: sinamics/ztnet:dev-88aeeab

This is still a work in progress, feel free to suggest improvements

NOTE! Do not test in production, this version has an updated db shcema that might change until next release, so try it out in a test environment.

#503

[fildunsky]

Dear developer, have you added this option to the main branch already? I am also trying to add some custom moons to my ZTNet. Is it possible to do it manually?

[sinamics]

This has not been implemented.
You can add it manually.

https://docs.zerotier.com/roots/

[ChristoffBo]

Hi, also intrested in this. Will this be added at some point?
Thank you for this awesome software.

[FallenChromium]

I believe you could still try the image and see if it works guys. Due to many events that happened in my life since I've posted this, I am currently unable to test it in a proper environment and I'm not even using ZeroTier anymore since I don't have a home lab anymore. I guess the dev could use your feedback to implement it.

Big thanks a lot for making a draft PR. Sorry I couldn't respond to you and check it out, been through a lot.
Peace ✌️