[gnome-contacts] CI: Fix flatpak job

[Jordan Petridis <jpetridis src gnome org>]

commit 777a19431fd00611e9b1184ffc943872b618f869
Author: Jordan Petridis <jordanpetridis protonmail com>
Date:   Tue Jul 24 10:30:14 2018 +0000

    CI: Fix flatpak job

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index f1d00ba..446605f 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -10,7 +10,7 @@ stages:
 
 # We always use flatpak-builder to check if everything still works.
 flatpak:master:
-  image: registry.gitlab.com/alatiera/gnome-nightly-oci/gnome-master:latest
+  image: registry.gitlab.gnome.org/gnome/gnome-runtime-images/gnome:master
   stage: build-flatpak
   script:
     - flatpak-builder --stop-at=gnome-contacts app data/flatpak/org.gnome.Contacts.json