[gnome-software/wip/hughsie/FlatpakTransaction] trivial: Attempt to fix CI

[Richard Hughes <rhughes src gnome org>]

commit fee1fc94a4bc76d0162d0b7495e945a68c50a57a
Author: Richard Hughes <richard hughsie com>
Date:   Thu Jul 12 11:57:12 2018 +0100

    trivial: Attempt to fix CI

 .gitlab-ci.yml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 586f98c0..4376c5bc 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,4 +1,4 @@
-image: fedora:27
+image: fedora:28
 
 stages:
   - build
@@ -6,7 +6,7 @@ stages:
 before_script:
   # Update and use base build deps
   - dnf update -y && dnf -y install dnf-plugins-core @buildsys-build
-  - dnf -y builddep gnome-software
+  - dnf --enablerepo updates-testing -y builddep gnome-software
   # Some deps may not be sync'd
   - dnf -y install rpm-ostree-devel