Package post-install command

[OJFord]

rustup for example needs rustup default stable to be run before it can be useful (and it is needed for some AUR packages).

It would be convenient therefore to have some way of doing something like:

AddPackage rustup --then-run='rustup default stable'

otherwise we can have situations where the first apply (which adds rustup) will fail (when it tries to use it), but then on second run (after running that command, or because the configuration includes it) it will work.

[CyberShadow]

Sorry, this lies outside the model that aconfmgr works with. You can capture the effects of running that command in your configuration; running the command itself is not possible because aconfmgr doesn't know what it will do when compiling the configuration.