guix: home: Add try command.
- guix/scripts/home.scm: Support try command.
This should allow you to enter a 'guix environment'-like shell where your home is set to home as defined by the scm file you pass along. e.g. guix home try my-home-file.scm
.
I'm open to suggestions to make this more robust, but have been using it for 2 months already.