Signed-off-by: Alexander Diewald <diewald@fortiss.org>

Signed-off-by: Alexander Diewald <diewald@fortiss.org>

Signed-off-by: Alexander Diewald <diewald@fortiss.org>

* Also, use untracked artifacts and dependencies such
  that intermediate artifacts are not included in the 
  pipeline's artifacts.

Signed-off-by: Alexander Diewald <diewald@fortiss.org>

Signed-off-by: Alexander Diewald <diewald@fortiss.org>

* Use a custom docker image that has the required libraries installed.
  It is based on the official maven image.
* Fixup caching (define the key).
* Start Xvfb before launching the tests. Required to get a fake display
  that allows starting up the eclipse application.

Signed-off-by: Alexander Diewald <diewald@fortiss.org>

Signed-off-by: Alexander Diewald <diewald@fortiss.org>