Run Openlab builds periodically
Run Openlab builds periodically

Runs periodically at UTC-0 0:00, 8:00 and 16:00

[#158932099](https://www.pivotaltracker.com/story/show/158932099)

Co-authored-by: David Ansari <1fc10f46b774f6939d18bebc734f673f94104821@sap.com>

cloudfoundry-incubator/bosh-openstack-cpi-release,cloudfoundry-incubator/bosh-openstack-cpi-release,cloudfoundry-incubator/bosh-openstack-cpi-release