Implement IP echo

dockerfile

@@ -0,0 +1,32 @@
+FROM golang:1.22.4-bullseye as base
+
+RUN adduser \
+	--disabled-password \
+	--gecos "" \
+	--home "/nonexistent" \
+	--shell "/sbin/nologin" \
+	--no-create-home \
+	--uid 65532 \
+	small-user
+
+WORKDIR $GOPATH/src/app/
+
+COPY . .
+
+RUN go mod download
+RUN go mod verify
+
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o /main .
+
+FROM scratch
+
+COPY --from=base /usr/share/zoneinfo /usr/share/zoneinfo
+COPY --from=base /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
+COPY --from=base /etc/passwd /etc/passwd
+COPY --from=base /etc/group /etc/group
+
+COPY --from=base /main .
+
+USER small-user:small-user
+
+CMD ["/main"]