I would like to be able to pipe files into guix commands. Specifically the `guix system build` command, so I can build a system configuration on a remote Guix system over SSH, i.e. `cat config.scm | ssh <remote-system> guix system build -`, or perhaps using the `--expression` flag which would make more sense, e.g. `cat config.scm | ssh <remote-system> guix system build -e -`.
While you can currently just copy over a file and then use that, it would be a little cleaner and more stateless to use a pipe. What do other people think?
