CI: Install our own version of golang.
CI: Install our own version of golang.

Signed-off-by: Andrea Luzzardi <442ffe3ffbfd024afcf0b7f8b108d05bca3aae43@gmail.com>

cheyang/swarmkit,runshenzhu/swarmkit,docker/swarmkit,aaronlehmann/swarmkit,sungwonh/swarmkit,fate-grand-order/swarmkit,RenaudWasTaken/swarmkit,Noyan759/swarmkit,cheyang/swarmkit,deljuven/swarmkit,deljuven/swarmkit,diogomonica/swarmkit,fate-grand-order/swarmkit,yp-engineering/swarmkit,elifa/swarmkit,alyyousuf7/swarmkit,sungwonh/swarmkit,dperny/swarmkit-1,vasil-yordanov/swarmkit,dperny/swarmkit-1,jlhawn/swarmkit,allencloud/swarmkit,RenaudWasTaken/swarmkit,runshenzhu/swarmkit,vasil-yordanov/swarmkit,AliyunContainerService/swarmkit,jlhawn/swarmkit,cezarsa/swarmkit,docker/swarmkit,cezarsa/swarmkit,Noyan759/swarmkit,yp-engineering/swarmkit,aaronlehmann/swarmkit,alyyousuf7/swarmkit,diogomonica/swarmkit,AliyunContainerService/swarmkit,yongtang/swarmkit,yongtang/swarmkit,elifa/swarmkit,allencloud/swarmkit