[gnome-build-meta/abderrahim/ci-improvements: 7/13] .gitlab-ci.yml: only run run the track job on branches targetting master

[Abderrahim Kitouni <akitouni src gnome org>]

commit 6816482198ed9e0d147a32310d106e1af528c271
Author: Abderrahim Kitouni <akitouni gnome org>
Date:   Fri Apr 19 16:11:09 2019 +0100

    .gitlab-ci.yml: only run run the track job on branches targetting master

 .gitlab-ci.yml | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 3e98b80e..31fa63e4 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -155,9 +155,10 @@ track:
   script:
     - ${BST} track --deps all core.bst flatpak-runtimes.bst
   retry: 2
-  # don't run on stable branches
-  except:
-    - /^gnome-\d-\d\d$/
+  # only run on branches targeting master
+  only:
+    variables:
+      - $FLATPAK_BRANCH == 'master'
   artifacts:
     when: always
     paths: