[gnome-runtime-images/abderrahim/buildah] Apply suggestion to .gitlab-ci.yml

[Abderrahim Kitouni <akitouni src gnome org>]

commit 3a6ce7c7116fd9a8d88e1e5ef698ee125529cc62
Author: Abderrahim Kitouni <a kitouni gmail com>
Date:   Fri Aug 2 19:15:56 2019 +0000

    Apply suggestion to .gitlab-ci.yml

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 9d3a8e9..a89119a 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,4 +1,4 @@
-image: fedora:latest
+image: 'registry.fedoraproject.org/fedora:30'
 
 # Buildah can't use 'overlay' driver when running inside docker
 variables: