CI: Host compressed tar file instead of pure 7z
CI: Host compressed tar file instead of pure 7z

In order to preserve file permissions. Addresses the failure
of build #48

jklarowicz/FiberTaskingLib,jklarowicz/FiberTaskingLib,underscorediscovery/FiberTaskingLib,jklarowicz/FiberTaskingLib,Samana/FiberTaskingLib,Samana/FiberTaskingLib,underscorediscovery/FiberTaskingLib