Provide Job yaml description to manually provision a swarm cluster using the APB (but without the ASB)

Currently the ASB is broken in openshift-dev, so until the upgrade to 3.10 we'll still need to (un)provision manually

I think the best way to do that would be to run the APB in a Job using the exact same parameters that the ASB uses. We can use the gitlab-operations serviceaccount to run the Job's pod which has the necessary permissions.

All we need is the yaml definition of a pod created by a working ASB, from that we can write a Job definition.

This should replace any other manual provisioning steps in the README