[gnome-shell] ci: Don't define image globally

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

commit d512209c62f5e83ef32084963156672231e355a2
Author: Florian Müllner <fmuellner gnome org>
Date:   Mon Jul 11 00:02:53 2022 +0200

    ci: Don't define image globally
    
    This has been deprecated in favor of defining the default image
    in the default section.
    
    Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2371>

 .gitlab-ci.yml | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index dfe115c702..2884ebf013 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -13,6 +13,7 @@ stages:
   - deploy
 
 default:
+  image: registry.gitlab.gnome.org/gnome/mutter/fedora/35:x86_64-2022-07-11.0
   # Cancel jobs if newer commits are pushed to the branch
   interruptible: true
   # Auto-retry jobs in case of infra failures
@@ -31,8 +32,6 @@ variables:
   LINT_LOG: "eslint-report.xml"
   LINT_MR_LOG: "eslint-mr-report.xml"
 
-image: registry.gitlab.gnome.org/gnome/mutter/fedora/35:x86_64-2022-07-11.0
-
 workflow:
   rules:
     - if: '$CI_MERGE_REQUEST_IID'