Earlier quoted context omitted.
Both statements are valid for StageX
How to define the list of installed packages in a config file in StageX, and tell the system that it should be the new list of packages? Like done in nixos If I remove a package from the list itt best uninstalled, if I add it gets installed, etc
That containerfile defines an entire deterministic custom OS image, every package, and every configuration etc.
Many patterns are possible, though this will be made way easier with our upcoming "box" primitives