fix clean /etc/hosts bug

build-in-docker-and-put-oss.sh

@@ -2,4 +2,4 @@
 COMMIT_SHA1=$(git rev-parse --short HEAD || echo "0.0.0")
 docker run -v $GOPATH/src/github.com/fanux/sealos:/go/src/github.com/fanux/sealos -w /go/src/github.com/fanux/sealos --rm golang:1.13.5 \
   go build -o sealos -mod vendor -ldflags "-X github.com/fanux/sealos/version.Version=$1 -X github.com/fanux/sealos/version.Build=${COMMIT_SHA1}" main.go
-../ossutil64 -c ../oss-config cp sealos oss://sealyun/$1/sealos
+../ossutil64 -c ../oss-config cp -f sealos oss://sealyun/$1/sealos