[rhythmbox/wip/hadess/post-install: 3/5] ci: Add GTK4 tools package

[Bastien Nocera <hadess src gnome org>]

commit 2bbb81ce0f1a7044b9e8c2e884cf0f40ae58b3bf
Author: Bastien Nocera <hadess hadess net>
Date:   Wed May 4 09:12:40 2022 +0200

    ci: Add GTK4 tools package
    
    This will be used to run gtk4-update-icon-cache.

 .gitlab-ci.yml | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index e33da7f56..ea28a861e 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -12,6 +12,7 @@ variables:
     gtk-doc-tools
     pkg-config
     libgtk-3-dev
+    libgtk-4-bin
     libgstreamer1.0-dev
     libgstreamer-plugins-base1.0-dev
     libgdk-pixbuf2.0-dev