[gnome-shell-extensions] ci: Instruct gitlab to checkout submodules

[Marge Bot <marge-bot src gnome org>]

commit bb5869f8dfc53cff148e2cf06d57e442cdcd9413
Author: Florian Müllner <fmuellner gnome org>
Date:   Sun Jul 10 23:04:08 2022 +0200

    ci: Instruct gitlab to checkout submodules
    
    ... instead of doing it in the script.
    
    This will become important when we switch to a CI image with an
    updated meson version that no longer checks out submodules as
    part of the dist command.
    
    Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell-extensions/-/merge_requests/237>

 .gitlab-ci.yml | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 14da0c2..a53e93f 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -132,8 +132,8 @@ fedora-build:
   stage: build
   needs:
     - build-fedora-container
-  before_script:
-    - git submodule update --init
+  variables:
+    GIT_SUBMODULE_STRATEGY: normal
   script:
     - meson setup build --werror -Dextension_set=all -Dclassic_mode=true
     - meson compile -C build
@@ -150,8 +150,8 @@ fedora-dist:
   stage: deploy
   needs:
     - fedora-build
-  before_script:
-    - git submodule update --init
+  variables:
+    GIT_SUBMODULE_STRATEGY: normal
   script:
     - meson dist -C build
   rules: