fix caddy  failed download (#1977)
fix caddy  failed download (#1977)

* fix caddy  failed download
* RUN command inline
hnquang112/laradock,springjk/laradock,zuohuadong/laradock,arkadiusjonczek/laradock,luciano-jr/laradock,jinnawat/laradock,LaraDock/laradock,bestlong/laradock,jinnawat/laradock,luciano-jr/laradock,springjk/laradock,zuohuadong/laradock,Harmonic/laradock,zuohuadong/laradock,hnquang112/laradock,hnquang112/laradock,arkadiusjonczek/laradock,Harmonic/laradock,bestlong/laradock,zuohuadong/laradock,AliveCorpse/laradock,jinnawat/laradock,Harmonic/laradock,springjk/laradock,hnquang112/laradock,Harmonic/laradock,bestlong/laradock,arkadiusjonczek/laradock,bestlong/laradock,AliveCorpse/laradock,jinnawat/laradock,arkadiusjonczek/laradock,springjk/laradock,bestlong/laradock