making Docker file multi-stage build

Dockerfile

@@ -1,9 +1,14 @@
-FROM golang:alpine
+FROM golang:alpine as builder
 ENV GO111MODULE=on
-WORKDIR /app
-ADD ./ /app
+WORKDIR /builder
+ADD ./ /build
 RUN apk update --no-cache
 RUN apk add git
 RUN go build -o golang-test  .
+
+
+FROM alpine:3.14
+WORKDIR /app
+COPY --from=builder /build/golang-test .
+EXPOSE 8000
 ENTRYPOINT ["/app/golang-test"]
-EXPOSE 8000