Extend mta build step to install maven artefacts after build to allow re-using them in later stages (additional unit or integration tests which might not be running as part of the "build" life-cycle).
* Provide a timeout of 20m for the go IT Default is 10m, see https://golang.org/cmd/go/#hdr-Testing_flags Co-authored-by: Daniel Kurzynski <daniel.kurzynski@sap.com>
