golang项目打包docker精简大小方法

RUN go get -u github.com/esrrhs/pingtunnel

RUN go get -u github.com/esrrhs/pingtunnel/...

RUN go install github.com/esrrhs/pingtunnel

FROM debian

COPY --from=build-env /go/bin/pingtunnel .

WORKDIR ./

FROM golang AS build-env