[gnome-shell] ci: Use the CI image produced by the pipeline

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

commit 1fbf62f0c656fce276155fc47ba7baf0dce13030
Author: Florian Müllner <fmuellner gnome org>
Date:   Fri Nov 20 15:53:51 2020 +0100

    ci: Use the CI image produced by the pipeline
    
    The newly-added eslint_mr job still uses the manually built
    extension image instead of the image that is built as part
    of the pipeline.
    
    Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1504>

 .gitlab-ci.yml | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 60b58363d6..3af90bca80 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -100,7 +100,9 @@ eslint:
         when: always
 
 eslint_mr:
-    image: registry.gitlab.gnome.org/gnome/gnome-shell/extension-ci:v2
+    extends:
+        - .fdo.distribution-image@fedora
+        - .gnome-shell.fedora:33
     stage: review
     script:
         - export NODE_PATH=$(npm root -g)