[file-roller/barthalion/gnome-runtime-images-quay] Update (or drop) the Docker image used by Flatpak job

[Bartłomiej Piotrowski <bpiotrowski src gnome org>]

commit 0c4786c02e8e668101a691ffde4aace84511fbca
Author: Bartłomiej Piotrowski <b bpiotrowski pl>
Date:   Wed Jul 27 12:38:38 2022 +0200

    Update (or drop) the Docker image used by Flatpak job
    
    The gnome-runtime-images have been recently migrated to Quay. This is already reflected in the template.
    
    Please note this MR has been created semi-automatically. If it doesn't make sense, feel free to close it.

 .gitlab-ci.yml | 1 -
 1 file changed, 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index b1762c43..7020c464 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -10,7 +10,6 @@ build:
         - nix-build
 
 flatpak:
-    image: 'registry.gitlab.gnome.org/gnome/gnome-runtime-images/gnome:master'
     extends: '.flatpak'
     variables:
         MANIFEST_PATH: "flatpak/org.gnome.FileRoller.json"