auto update lxc

[elmakus]

Could you also add instrucions how to add automatic update for apps which are not updated via apt update apt upgrade? like epshome, ngix, nodered etc. with option to turn on and turn off (somehow updated Heimdall is not working. when i reverted backup its working again. in case of that one could turn off autopdate until finds a problem).

And maybe automatic update and upgrade lxc every day or something like that