Detect broken Internet connection

When a WAN is down and Internet connection is not available, updater "spam" Foris notifications with:

unreachable: https://repo.turris.cz/omnia/lists/base.lua: Couldn't resolve host 'repo.turris.cz'

which is a bit cryptic, especially for new Turris users.

It would be really nice to enhance user experience and lower "false issues" like that (that's really not unique).

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information

Admin message