Discard old builds

Change-Id: I066ef3c714ec59390f1ea2b84a5daf3ce6af831b
diff --git a/jjb/global/global-templates-push-upstream.yaml b/jjb/global/global-templates-push-upstream.yaml
index 322efa4..032a717 100644
--- a/jjb/global/global-templates-push-upstream.yaml
+++ b/jjb/global/global-templates-push-upstream.yaml
@@ -7,6 +7,9 @@
 
     concurrent: true
 
+    properties:
+      - logrotate
+
     parameters:
       - project-parameters:
           project: '{project}'