Monitor tailscale key expiry

[claha]

https://github.com/tailscale/tailscale/blob/main/api.md

[claha]

Need to parse a date string which doesn't seem possible (right now) in gatus

[claha]

Seems home-assistant has a tailscale integration, so perhaps easier to do it there. Could also generate a dashboard and remove them from the homepage dashboard.
Will need to add support for keyExpiryDisabled (or what it is named) to home-assistant, supports seems to exist in the python library used so should be fairly easy.

[claha]

Since I am using gatus to ping all my tailscale machinesI will get a notification if one can't be reach. My workflow is usually that I then try to ssh to it and if that fails I will probably go to the tailscale admin panel and I will see that the key has expired.

It would nice with a notification from homeassistant a day or so before but it is not crucial. Keeping it open for now but prio is low.

[claha]

One step closer :)
home-assistant/core#117667