增加加速镜像 apk 和 go

Dockerfile.backend

@@ -1,8 +1,16 @@
 ARG GO_BUILDER_IMAGE=docker.m.daocloud.io/library/golang:1.26-alpine
 ARG BACKEND_RUNTIME_IMAGE=docker.m.daocloud.io/library/alpine:3.22
+ARG GOPROXY=https://goproxy.cn,direct
+ARG GOSUMDB=sum.golang.google.cn
+ARG ALPINE_MIRROR=https://mirrors.aliyun.com/alpine
 
 FROM ${GO_BUILDER_IMAGE} AS builder
 
+ARG GOPROXY
+ARG GOSUMDB
+ENV GOPROXY=${GOPROXY}
+ENV GOSUMDB=${GOSUMDB}
+
 WORKDIR /app
 
 # 复制 Go 依赖文件 / Copy Go dependency files
@@ -18,7 +26,9 @@ RUN CGO_ENABLED=0 GOOS=linux go build -o /server ./cmd/server
 # 最终运行镜像 / Runtime image
 FROM ${BACKEND_RUNTIME_IMAGE}
 
-RUN apk --no-cache add ca-certificates tzdata curl
+ARG ALPINE_MIRROR
+RUN sed -i "s|https://dl-cdn.alpinelinux.org/alpine|${ALPINE_MIRROR}|g; s|http://dl-cdn.alpinelinux.org/alpine|${ALPINE_MIRROR}|g" /etc/apk/repositories \
+	&& apk --no-cache add ca-certificates tzdata curl
 
 WORKDIR /app