refactor: 重构 Docker 构建流程，使用多阶段构建

Dockerfile

@@ -1,13 +1,20 @@
+FROM golang:1.25-alpine AS builder
+
+ARG TARGETARCH
+
+WORKDIR /app
+COPY src/go.mod src/go.sum ./
+RUN go mod download && apk add upx
+
+COPY src/ .
+
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=${TARGETARCH} go build -ldflags="-s -w" -trimpath -o hubproxy . && upx -9 hubproxy
+
 FROM alpine
 
 WORKDIR /root/
 
-ENV BINARY_NAME=hubproxy
-
-ARG TARGETOS
-ARG TARGETARCH
-
-COPY src/config.toml .
-COPY build/hubproxy/${BINARY_NAME}-${TARGETOS}-${TARGETARCH} ${BINARY_NAME}
+COPY --from=builder /app/hubproxy .
+COPY --from=builder /app/config.toml .
 
 CMD ["./hubproxy"]