feat: add zerotier extension to Talos

[ht-danielgo]

• This builds a Zerotier 1.14.2 (latest as of writing) for use as a Talos extension
• Tested OK on a Talos 1.8.4 host
• Requires a service config that looks like this

apiVersion: v1alpha1
kind: ExtensionServiceConfig
name: zerotier
configFiles:
  - content: ' '
    mountPath: /var/lib/zerotier-one/networks.d/<network id>.conf
  - content: <zerotier-idtool secret file content>
    mountPath: /var/lib/zerotier-one/identity.secret
  - content: <zerotier-idtool public file content>
  - mountPath: /var/lib/zerotier-one/identity.public

[frezbo]

talos doesn't ship any of those commands so I'm not sure sbin mount has any effect

[ht-danielgo]

This is fair, i took it straight from the WG extension, but will remove

[ht-danielgo]

Just want to pause on this for a bit as I have a better way to deal with the configuration of the ZT credentials that will make configuration much easier, should have it ready end of week