Build signed and packed update sites for BPMN2 Modeler

https://git.eclipse.org/r/bpmn2/org.eclipse.bpmn2.git

Resulting sites:

http://download.eclipse.org/bpmn2-modeler/updates/nightly

To publish the result:

https://ci.eclipse.org/bpmn2/job/bpmn2-modeler-publish/