implement NUT/UPS solution

[billimek]

Currently,

All UPS monitoring & actions are handled at the host OS layer. With the pending move to talos-based clusters, a different solution is going to be needed. A brief exploration into the native talos nut-client extension resulted in the desire to explore an alternative solution:

• implement ups/nut solution to communicate with USB-based UPSs on all physically-connected devices
  • this should alert to discord when power events occur
• implement some form of ups/nut client on isolated systems also receiving power from connected devices above
• all configured devices should power-down at some predetermined battery runtime/percentage threshold

Landscape:

• "ups-a"
  • cyberpower ??? model
  • connected to:
    • nix nas
    • ?
• "ups-b"
  • cyberpower ??? model
  • connected to:
    • proxmox-b host which will eventually become k8s-b (talos) node
    • ?
• "ups-c"
  • cyberpower ??? model
  • connected to:
    • proxmox-c host which will eventually become k8s-c (talos) node
• "ups-dining"
  • cyberpower ??? model
  • connected to:
    • ? rpi4 host
    • unifi 8 poe switch
    • unifi 8 poe switch
• "ups-closet"
  • cyberpower ??? model
  • connected to:
    • k3s-h node which will eventually become k8s-h (talos) node
    • unifi 16-port poe switch
    • opnsense router device
    • att fiber gateway