more docker testing

Dockerfile

@@ -1,11 +1,14 @@
-FROM golang:1.14.6-alpine3.12
-RUN mkdir /src
-ADD . /src
-WORKDIR /src
+FROM golang:latest as builder
+RUN mkdir -p /go/src/folder
+WORKDIR /go/src/folder
+COPY /src .
 
+RUN go get -d
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -a -installsuffix cgo -o main .
+
+FROM alpine:latest
+WORKDIR /
+COPY --from=builder /go/src/folder/main .
 EXPOSE 8080
 
-RUN go get -u ./...
-RUN go build -o main .
-
-ENTRYPOINT ["/src/main"]
+CMD ["/main"]