I expect apt commands to automatically download missing sources
in 24.10 or 25.04. It stands to reason we could add Disabled
sources too, and if you specify apt install foo/oracular-proposed
it just goes tweaks the bit, runs the update on it, and then
installs the package from it.
Also useful
In the past [1] I was suggesting something similar, and IMHO it would be
quite useful for having better SRU testing tooling too.
It's true that using `apt -t *-proposed` would work well for testing,
but I was wondering if that should also come with an
`ubuntu-sru-verifier` (or better name) tool
