installer: Include icewm as a desktop environment.

* gnu/installer/services.scm (%system-services): Include icewm as a desktop
environment.
* gnu/tests/install.scm (installation-target-desktop-os-for-gui-tests): Add
icewm to the list of packages.
* etc/manifests/release.scm: (%system-packages): Add icewm.

Change-Id: I881c1dd4289281e51c81d83fac785ef064e6ff6a
Signed-off-by: Christopher Baines <mail@cbaines.net>

etc/manifests/release.scm

@@ -68,7 +68,7 @@ TARGET."
   ;; Key packages proposed by the Guix System installer.
   (append (map specification->package
                '("xorg-server" "xfce" "gnome" "mate" "enlightenment"
-                 "openbox" "awesome" "i3-wm" "ratpoison"
+                 "icewm" "openbox" "awesome" "i3-wm" "ratpoison"
                  "emacs" "emacs-exwm" "emacs-desktop-environment"
                  "xlockmore" "slock" "libreoffice"
                  "connman" "network-manager" "network-manager-applet"

gnu/installer/services.scm

@@ -83,6 +83,9 @@
      (desktop-environment
       (name "Enlightenment")
       (snippet '((service enlightenment-desktop-service-type))))
+     (desktop-environment
+      (name "Icewm")
+      (snippet '((specification->package "icewm"))))
      (desktop-environment
       (name "Openbox")
       (packages '((specification->package "openbox"))))

gnu/tests/install.scm

@@ -2013,7 +2013,7 @@ build (current-guix) and then store a couple of full system images.")
     ;; Make sure that all the packages and services that may be used by the
     ;; graphical installer are available.
     (packages (append
-               (list openbox awesome i3-wm i3status
+               (list icewm openbox awesome i3-wm i3status
                      dmenu st ratpoison xterm
                      emacs emacs-exwm emacs-desktop-environment)
                %base-packages))