[CI] for #5: correct paths for libfreenect2 and openFrameworks and use pushd
[CI] for #5: correct paths for libfreenect2 and openFrameworks and use pushd

OpenISS/OpenISS,OpenISS/OpenISS,OpenISS/OpenISS,OpenISS/OpenISS,OpenISS/OpenISS,OpenISS/OpenISS,OpenISS/OpenISS