Stop cron schedule for docker-merge

We do not need to re-build the docker images on a
schdueled basis whenever there is no code change.
Run this job for only new code detected.

Change-Id: Ia8244ce90d8f1fdf5a2862875380c5ecd7695349
Issue-ID: INT-634
Signed-off-by: Jessica Wagantall <jwagantall@linuxfoundation.org>
1 file changed