bug#32955: Cuirass: Some tests depend on 'guix-current', which makes them resource expensive

[Clément Lassieur]

Hi,

Tests depending on 'guix-current' are expensive in terms of CPU and
storage usage since we need to build (current-guix) and then store a
couple of full system images.

They are built at each evaluation because they depend on 'guix-current'.
(And they all fail.)

    test.btrfs-root-os.x86_64-linux
    test.encrypted-root-os.x86_64-linux
    test.installed-extlinux-os.x86_64-linux
    test.separate-home-os.x86_64-linux
    test.raid-root-os.x86_64-linux
    test.separate-store-os.x86_64-linux
    test.iso-image-installer.x86_64-linux
    test.installed-os.x86_64-linux
    
    test.btrfs-root-os.i686-linux
    test.encrypted-root-os.i686-linux
    test.installed-extlinux-os.i686-linux
    test.separate-home-os.i686-linux
    test.raid-root-os.i686-linux
    test.separate-store-os.i686-linux
    test.iso-image-installer.i686-linux
    test.installed-os.i686-linux

It seems that the reason is explained by that comment in
gnu/tests/install.scm:

    ;; Since the image has no network access, use the
    ;; current Guix so the store items we need are in
    ;; the image and add packages provided.

Is there another way to get those tests to work without depending on
'guix-current'?

Clément