[gnome-control-center] CI: do not run 'pages' if not testing

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 6285ebd1e565cc4e887eb0ec58c4fdae3bc0a7aa
Author: Claudio André <claudioandre br gmail com>
Date:   Sun Aug 5 21:17:32 2018 -0300

    CI: do not run 'pages' if not testing
    
    The job "pages" should only run on regular test CI executions.

 .gitlab-ci.yml | 5 +++++
 1 file changed, 5 insertions(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index c46f51c95..807db0af9 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -133,6 +133,11 @@ pages:
   only:
     - master@GNOME/gnome-control-center
 
+  except:
+    variables:
+      - $CRON_TASK == "BUILD_CI_IMAGES"
+      - $CI_COMMIT_TITLE =~ /^Update.*translation$/
+
 ##
 # Stage: Manual
 #