[gnome-games] ci: make nightly deps explicit

[Jordan Petridis <jpetridis src gnome org>]

commit 3a7e669598d5650e4c7a4cf48cf2bdfb93438410
Author: Jordan Petridis <jpetridis gnome org>
Date:   Sun Aug 2 16:20:16 2020 +0000

    ci: make nightly deps explicit

 .gitlab-ci.yml | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 7057d7a78..a9a82715c 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -29,3 +29,5 @@ flatpak:
 
 nightly:
   extends: '.publish_nightly'
+  dependencies: ['flatpak']
+  needs: ['flatpak']