feat: docker.

Dockerfile

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+# 构建阶段
+FROM golang:1.23-alpine AS builder
+WORKDIR /app
+COPY go.mod go.sum ./
+RUN go mod download
+COPY . .
+RUN CGO_ENABLED=0 GOOS=linux go build -o main .
+
+# 运行阶段
+FROM alpine:latest
+WORKDIR /app
+COPY --from=builder /app/main .
+COPY config.yaml ./
+EXPOSE 8080
+CMD ["./main"]