[Bio-packaging] Ruby support in GNU Guix

[Pjotr Prins]

David Thompson added bundler support for Ruby in
http://git.savannah.gnu.org/cgit/guix.git/commit/?id=2cbc105bb358ca473e35395b57b5af2c54110567

I am testing it right now. 

It requires a tweak to the environment so the GEM_PATH
points at

  $HOME/.guix-profile/lib/ruby/gems/2.2.0/

The script I use to run Guix Ruby is at

  https://github.com/pjotrp/guix-notes/blob/master/scripts/ruby-guix-env

that essentially replaces the old rvm or rbenv! So much better :). More
documentation can be found at
https://github.com/pjotrp/guix-notes/blob/master/INSTALL

It would be good if others could test Ruby in a development
environment. These days it is really easy to install Guix. Simply
unpack the tar ball and start the daemon. See

  https://github.com/pjotrp/guix-notes/blob/master/INSTALL#L48

  https://github.com/pjotrp/guix-notes/blob/master/INSTALL#L95

and

  https://github.com/pjotrp/guix-notes/blob/master/INSTALL#L115