go-build-in-docker:意外的二进制in/go/bin

根据这篇帖子: What does go build build?

go build go install 将二进制文件移到 $GOPATH/bin .

我的机器就是这样工作的。但是,我有一个Dockerfile:

FROM golang:latest
ADD . /go/src/myapp
WORKDIR /go/src/myapp
RUN go get .
RUN go build 
RUN ls /go/bin # shows myapp!!
ENTRYPOINT ["/go/bin/myapp"] #works!!

/go/bin myapp 会是 /go/src/myapp/myapp 相反,我看到构建像install一样工作,二进制文件显示在/go/bin中。为什么?