[gnome-panel] ci: don't run CI for tags

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 45ae291fe121ec57a0789f3b39f63c30b5c912f8
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Tue Mar 3 03:29:57 2020 +0200

    ci: don't run CI for tags

 .gitlab-ci.yml | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 3881da2be..3572a4bae 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -4,6 +4,8 @@ stages:
 build-ubuntu:
   image: ubuntu:devel
   stage: build
+  except:
+    - tags
   before_script:
     - export DEBIAN_FRONTEND=noninteractive
     - apt-get update