[gnome-tour] ci: make deps of nightly job explicit

[Jordan Petridis <jpetridis src gnome org>]

commit dded4ebb98372300412373701fc8964559582be8
Author: Jordan Petridis <jpetridis gnome org>
Date:   Mon Aug 3 21:43:52 2020 +0000

    ci: make deps of nightly job explicit

 .gitlab-ci.yml | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 086162b..189c5d3 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -14,6 +14,8 @@ flatpak:
 
 nightly:
   extends: '.publish_nightly'
+  dependencies: ['flatpak']
+  needs: ['flatpak']
 
 # Configure and run rustfmt
 # Exits and builds fails if on bad format