Feature #12615: Consider basing Tails on quarterly snapshots of Debian testing
Decide when we want to release Tails based on Debian Buster
Rebase Tails on Debian Buster.
And so our experiment to evaluate whether Tails should be based on
Debian testing begins!
Note that for now we won't treat it as a base branch, and just base it
on devel. This way we don't have to keep the devel and feature-buster
APT suite synced, and instead we can use feature-buster only for the
things deviating from devel.