refactor: Dockerfile.go

Dockerfile.golang

@@ -0,0 +1,25 @@
+# Build stage
+FROM golang:1.25-alpine AS build
+
+# 设置国内 Go 代理
+ENV GOPROXY=https://goproxy.cn,direct
+
+WORKDIR /src
+
+# Copy client library
+COPY kenaito-conf-go-client/ ./kenaito-conf-go-client/
+
+# Copy demo project
+COPY kenaito-conf-go-client-demo/ ./kenaito-conf-go-client-demo/
+
+# Build
+WORKDIR /src/kenaito-conf-go-client-demo
+RUN go mod tidy && go build -o /app/demo .
+
+# Runtime stage
+FROM alpine:3.20
+
+WORKDIR /app
+COPY --from=build /app/demo .
+
+ENTRYPOINT ["./demo"]