set voltha job to trigger nightly

Change-Id: Ib7bd79afe43f9bf7cece79e99e0480917b6ecd67
diff --git a/jjb/cord-test/nightly-build-pipeline.yaml b/jjb/cord-test/nightly-build-pipeline.yaml
index ac77fec..fda3ee1 100644
--- a/jjb/cord-test/nightly-build-pipeline.yaml
+++ b/jjb/cord-test/nightly-build-pipeline.yaml
@@ -880,7 +880,7 @@
     triggers:
        - timed: |
                  TZ=America/Los_Angeles
-                 H H/6 * * *
+                 H {time} * * *
 
 - job-template:
     name: 'build_{config-pod}_voltha_{release}_test'