[gnome-clocks] CI: re-add publish nightly

[Bilal Elmoussaoui <bilelmoussaoui src gnome org>]

commit 97abde7ea70566d0b117ebf5c0d8e770adb4bd00
Author: Bilal Elmoussaoui <bil elmoussaoui gmail com>
Date:   Sun Mar 1 20:32:00 2020 +0000

    CI: re-add publish nightly
    
    I somehow thought we inherited that as well by using the CI template.

 .gitlab-ci.yml | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 451b976..5eb0622 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -13,6 +13,9 @@ flatpak:
         APP_ID: "org.gnome.clocksDevel"
     extends: ".flatpak"
 
+nightly:
+  extends: '.publish_nightly'
+
 lint:
   image: "valalang/lint:latest"
   script: