need to clone the repository to load the list of the buid
targets in pre-node step.
added a git credential ID getter to clone repositories.
Signed-off-by: Marc Mattmüller <marc.mattmueller@netmodule.com>
this commit holds additionally a common jenkins file and a
file containing the targets (machines) to build. Latter is
used for the drop-down parameter in the build job.
Signed-off-by: Marc Mattmüller <marc.mattmueller@netmodule.com>