[fractal] ci: Fix aarch64 build

[Kévin Commaille <kcommaille src gnome org>]

commit 8578484359a93a589088fa6af978e856201dc7e7
Author: Kévin Commaille <zecakeh tedomum fr>
Date:   Sat Jul 2 21:21:33 2022 +0200

    ci: Fix aarch64 build

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index c13cc6872..ccf0d5cbe 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -9,7 +9,7 @@ variables:
   FLATPAK_MODULE: "fractal"
   RUNTIME_REPO: "https://nightly.gnome.org/gnome-nightly.flatpakrepo";
   CI_IMAGE_X86_64: "registry.gitlab.gnome.org/gnome/gnome-runtime-images/gnome:42"
-  CI_IMAGE_AARCH64: "registry.gitlab.gnome.org/gnome/gnome-runtime-images/aarch64:gnome-nightly"
+  CI_IMAGE_AARCH64: "registry.gitlab.gnome.org/gnome/gnome-runtime-images/aarch64:gnome-42"
 
 .hack:
   variables: