[Feature] Auto-Update

[bryphe]

We're missing the ability to 'auto-update' the builds - right now, to update and pick up the latest, you have to download it from the early access portal.

This is very inconvenient - it'd be ideal to have an auto-update option from the app!

The work required is:

• Create an endpoint to check for updates (based on a license key)
• For Windows:
  • Download the installer, verify codesign signature
  • Close the app and run the installer with silent
  • Restart the app
• For OSX:
  • Integrate squirrel
  • Hook up to installation endpoint / payload
• For Linux:
  • Investigate AppImageUpdate

[mkenigs]

Wanted to voice my preference per the 0.5.2 release note - more important to me to have something that plays nicely with NixOS updating than builtin auto-update. Not exactly sure what that would look like, but I think @lobre has taken a look at that in #2311

[ls-1N]

My 2 cents: As a (Linux) user, I always prefer OS package managers (like Flatpak (or Snap)) over app-integrated solutions which give me no transparency or opportunity for input.