download and expand ruby and devkit into chef file_cache_path vs omnibus/source
download and expand ruby and devkit into chef file_cache_path vs omnibus/source

racker/omnibus,racker/omnibus,racker/omnibus,racker/omnibus,racker/omnibus,racker/omnibus,racker/omnibus,racker/omnibus,racker/omnibus,racker/omnibus,racker/omnibus