As per the title, I'd like to resolve the Debian codename (e.g. "stretch", "buster", "bullseye", etc) of the current "testing".
Obviously there are a variety of ways to do this within an installed Debian "testing" system (e.g.
lsb_release -sc, among others as noted in answers to this question). But how do I do this from a Debian 'stable' (or even an alternate Linux distro)?
For example, I'm running Debian 'stable' (currently Debian 'buster') - how do I reliably determine what codename 'testing' currently has?
I realise that currently 'testing' = 'bullseye', but when 'bullseye' is released as 'stable', that will change (to 'bookworm' IIRC).