update: improve dockerfile size

Author: vdjagilev

Dockerfile

@@ -1,9 +1,13 @@
-FROM golang:1.23-alpine
+FROM golang:1.23-alpine AS builder
 
 WORKDIR /src/
 COPY . /src/
 
 RUN apk add --update gcc musl-dev
 RUN CGO_ENABLED=1 go build -o /bin/nmap-formatter
 
+FROM golang:1.23-alpine
+
+COPY --from=builder /bin/nmap-formatter /bin/nmap-formatter
+
 ENTRYPOINT ["/bin/nmap-formatter"]