[glib/wip/pwithnall/macos-yet-again] ci: Ensure git submodules are updated before running macOS CI

[Philip Withnall <pwithnall src gnome org>]

commit dc2c769d5c9b08de7014b954627149f9662d9f7b
Author: Philip Withnall <pwithnall endlessos org>
Date:   Thu Jun 30 01:31:02 2022 +0100

    ci: Ensure git submodules are updated before running macOS CI
    
    Since the macOS CI jobs are run on a machine which isn’t using a
    pre-made container image, we can’t ship a cached version of the
    subproject, so it has to be pulled as a git submodule.
    
    GitLab doesn’t do that by default unless you set
    `GIT_SUBMODULE_STRATEGY` to something other than `none`.
    
    See https://docs.gitlab.com/ee/ci/git_submodules.html
    
    Signed-off-by: Philip Withnall <pwithnall endlessos org>

 .gitlab-ci.yml | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 0195ed30fc..8fe839a758 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -435,6 +435,8 @@ macos:
   tags:
     - macos
   needs: []
+  variables:
+    GIT_SUBMODULE_STRATEGY: normal
   before_script:
     - bash .gitlab-ci/show-execution-environment.sh
     - pip3 install --user meson==0.60.1