GH-168 allow to specify relative workspace root dir
GH-168 allow to specify relative workspace root dir

Signed-off-by: Jan Koehnlein <23df7e449f68a6059bb601bff6aa0cd72d9882b1@typefox.io>

lmcgupe/theiagreenkeeperTest,lmcgupe/theiagreenkeeperTest,epatpol/theia-1,hexa00/theia,hexa00/theia,lmcgupe/theia,epatpol/theia-1,lmcgupe/theiagreenkeeperTest,lmcgupe/theia,epatpol/theia-1