Testing multi-stage build and single file docker image

Dockerfile

@@ -1,10 +1,8 @@
-# specify the base image to  be used for the application
-FROM golang:1.21.4-alpine
+# Build stage 
+FROM golang:1.21.4-alpine AS builder
 
-# create the working directory in the image
 WORKDIR /app
 
-# copy Go modules and dependencies to image
 COPY go.mod ./
 
 # download Go modules and dependencies
@@ -13,11 +11,14 @@ RUN go mod download
 # copy all the Go files ending with .go extension
 COPY *.go ./
 
-# compile application
-RUN go build -o /golang-http-header
+RUN go build -o golang-http-header
+
+# Final stage
+FROM scratch
+
+COPY --from=builder /app/golang-http-header /
 
 # network port at runtime
 EXPOSE 8000
 
-# execute when the container starts
-CMD [ "/golang-http-header" ]
+CMD ["/golang-http-header"]