Add Go implementation: main.go, Dockerfile, docker-compose.yml

Dockerfile

@@ -0,0 +1,12 @@
+FROM golang:1.22-alpine AS build
+WORKDIR /app
+COPY go.mod go.sum ./
+RUN go mod download
+COPY *.go ./
+RUN CGO_ENABLED=0 GOOS=linux go build -o server .
+
+FROM alpine:3.19
+RUN apk add --no-cache ca-certificates
+WORKDIR /app
+COPY --from=build /app/server .
+CMD ["./server"]