[polari/ci] ci: Include validation utils

[Gitlab System User <gitlab src gnome org>]

commit f023187dea8b686fc0602a53cd774be88e168409
Author: Florian Müllner <fmuellner gnome org>
Date:   Thu Oct 19 06:48:28 2017 +0200

    ci: Include validation utils
    
    Installing those tools will enable the corresponding tests ...

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 0e52a57..dc2f35f 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -6,7 +6,7 @@ stages:
 before_script:
   - dnf install -y gcc meson ninja-build redhat-rpm-config gettext itstool
                    gtk3-devel gjs-devel gobject-introspection-devel
-                   telepathy-glib-devel
+                   telepathy-glib-devel libappstream-glib desktop-file-utils
 
 build-polari:
   stage: build