rift package install ...

[Mesabloo]

This is a command missing in the current implementation.
Typing rift package install X would:

1. fetch X in the global LTS (or unstable if unspecified)
2. check whether the X package is a library or an executable
   2.1. if X is a library, build and generate all .zci/.zco files needed for later
   2.2. if X is an executable, build it and install it in the local bin path (to be specified, defaults to the XDG bin path⁽¹⁾)

If X is unspecified on the command-line, the local package is taken.

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⁽¹⁾: from the XDG spec at https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html

User-specific executable files may be stored in $HOME/.local/bin. Distributions should ensure this directory shows up in the UNIX $PATH environment variable, at an appropriate place.

Not sure where we'd put that on Windows and MacOS though.