update workspace dockerfile (#1759)
update workspace dockerfile (#1759)

fix workspace user laradock laravel command not found
Harmonic/laradock,AliveCorpse/laradock,luciano-jr/laradock,bestlong/laradock,schiggi/laradock,arkadiusjonczek/laradock,hnquang112/laradock,schiggi/laradock,arkadiusjonczek/laradock,Harmonic/laradock,jinnawat/laradock,zuohuadong/laradock,hnquang112/laradock,AliveCorpse/laradock,zuohuadong/laradock,springjk/laradock,bestlong/laradock,luciano-jr/laradock,jinnawat/laradock,schiggi/laradock,zuohuadong/laradock,hnquang112/laradock,bestlong/laradock,bestlong/laradock,LaraDock/laradock,bestlong/laradock,springjk/laradock,schiggi/laradock,arkadiusjonczek/laradock,hnquang112/laradock,Harmonic/laradock,Harmonic/laradock,springjk/laradock,jinnawat/laradock,springjk/laradock,arkadiusjonczek/laradock,jinnawat/laradock,zuohuadong/laradock