worker: add run-worker flag in example and turn it off by default
worker: add run-worker flag in example and turn it off by default

shidao-fm/qor,gavinzhs/qor,qor/qor,shaunstanislaus/qor,gavinzhs/qor,youprofit/qor,youprofit/qor,yanzay/qor,strogo/qor,amirrpp/qor,codedogfish/qor,strogo/qor,lance2088/qor,qor/qor,qor/qor,trigrass2/qor,lance2088/qor,jmptrader/qor,jmptrader/qor,shidao-fm/qor,codevlabs/qor,codevlabs/qor,trigrass2/qor,yanzay/qor,insionng/qor,insionng/qor,shaunstanislaus/qor,amirrpp/qor,codedogfish/qor