Minimal docker container with a multi-stage build

Dockerfile

FROM golang:1.14

WORKDIR /go/src/app
COPY . .

RUN go build hello-world.go

FROM scratch
COPY --from=0 /go/src/app/hello-world .
CMD ["./hello-world"]  

hello-world.go

package main
import "fmt"
func main() {
    fmt.Println("hello world")
}