[gexiv2/wip/exiv2-master-ci] ci: Add missing image for flatpak

[Jens Georg <jensgeorg src gnome org>]

commit de54577abbe0e29e3e563a47d7f547f500331650
Author: Jens Georg <mail jensge org>
Date:   Tue Nov 20 13:59:39 2018 +0100

    ci: Add missing image for flatpak

 .gitlab-ci.yml | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index df658b3..be993b3 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -15,6 +15,7 @@ stages:
   - deploy
 
 exiv2-master:
+  image: registry.gitlab.gnome.org/gnome/gnome-runtime-images/gnome:3.30
   stage: build
   script:
     - flatpak-builder build-dir build-aux/org.gnome.GExiv2.json --stop-at=gexiv2