Motivation:

Helmholtz marketplace webserver depends on this
repo artifact. Hence each new commit should
generate a snapshot that can be easily use by
the Helmholtz marketplace webserver.

Modification:

- create a settings.xml file which contain
    authentication data
- add a variable for the maven cli option that
    ensure that the artifact is deploy to the
    right server
- deploy the aritifact to nexus

Result:

Each commit and merge request will generate a new
artifact snapshot, which can be use by other repo.

Target: master