修复docker构建的问题

Dockerfile

@@ -6,7 +6,12 @@ FROM golang:1.26.8-alpine3.24 AS build
 
 WORKDIR /src
 
-RUN apk add --no-cache ca-certificates
+# Keep git in the builder because the default GOPROXY policy permits a
+# checksum-verified direct VCS fallback. It is not copied into the runtime.
+RUN apk add --no-cache ca-certificates git
+
+ARG GOPROXY=https://proxy.golang.org,direct
+ENV GOPROXY=${GOPROXY}
 
 COPY go.mod go.sum ./
 RUN go mod download