[gnome-usage] CI: Load submodules recursively

[Adrien Plazas <aplazas src gnome org>]

commit 6778d325a5d5a27528743c446d8c128c9d60dc96
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Mon Sep 23 16:54:58 2019 +0200

    CI: Load submodules recursively
    
    This is needed to add libhandy as a submodule in the next commit.

 .gitlab-ci.yml | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index b7a487e..1e08226 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -8,6 +8,8 @@ variables:
   BUNDLE: "org.gnome.Usage.Devel.flatpak"
 
 build:
+  variables:
+    GIT_SUBMODULE_STRATEGY: recursive
   before_script:
     - dnf update -y
     - dnf install -y gcc meson gettext gtk-doc vala gtk3-devel libgtop2-devel