Docker image pull timeout

Current builds fail due to a timeout during docker image pulls, e.g.:

ERROR: Failed to launch openpass-simulator-build-develop-110-xq99x-kdzrs-hslpv
01:07:18  io.fabric8.kubernetes.client.KubernetesClientTimeoutException: Timed out waiting for [180000] milliseconds for [Pod] with name:[openpass-simulator-build-develop-110-xq99x-kdzrs-hslpv] in namespace [openpass].

We should try setting a timeout explicitly like described here to fix that.