bug#38445: Guix CI evaluation broken

[Clément Lassieur]

Hi,

https://git.savannah.gnu.org/cgit/guix.git/commit/?id=99c45877a984dd0148151b2e304afef6fb04f1a5

broke Guix CI.

The reason is:

    (local-file (string-append "" "../some-file"))

now differs from

    (local-file "../some-file")

And in gnu/system/install.scm (line 246) there's a STRING-APPEND.

We could probably do an easy fix by changing (string-append
"exemples/" ...) to (string-append "gnu/system/exemples/" ...) but
still, I find that new behaviour weird.

Clément