Add timer periodic job pipeline

Change-Id: If580b088ed4cb41b144976a1b1795dca09ba9d26
diff --git a/zuul.d/pipelines.yaml b/zuul.d/pipelines.yaml
index 50415c4..053da90 100644
--- a/zuul.d/pipelines.yaml
+++ b/zuul.d/pipelines.yaml
@@ -122,3 +122,13 @@
       gerrit:
         - event: ref-updated
           ref: ^refs/tags/.*$
+
+- pipeline:
+    name: periodic
+    post-review: true
+    description: Jobs in this queue are triggered on a timer.
+    manager: independent
+    precedence: low
+    trigger:
+      timer:
+        - time: '0 1 * * *'