build: 完善一键部署脚本

backend/Dockerfile

@@ -1,9 +1,11 @@
 # ---- Build Stage ----
 FROM golang:1.26-alpine AS builder
 
+RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories
+RUN apk add --no-cache git
 WORKDIR /src
 COPY go.mod go.sum ./
-RUN go mod download
+RUN go env -w GOPROXY=https://goproxy.cn,direct && go mod download
 
 COPY . .
 RUN CGO_ENABLED=0 GOOS=linux go build -o /bin/gen2d ./cmd/main.go
@@ -11,6 +13,7 @@ RUN CGO_ENABLED=0 GOOS=linux go build -o /bin/gen2d ./cmd/main.go
 # ---- Runtime Stage ----
 FROM alpine:3.20
 
+RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories
 RUN apk add --no-cache ca-certificates
 COPY --from=builder /bin/gen2d /usr/local/bin/gen2d