build(Dockerfile): 更新Dockerfile以支持多平台交叉编译

修改Dockerfile以使用BUILDPLATFORM和TARGETPLATFORM参数，支持多平台交叉编译
优化arm平台的GOARM设置逻辑，并添加编译优化参数

Dockerfile

@@ -1,7 +1,9 @@
-FROM golang:1.21-alpine AS build
-ARG TARGETOS=linux
-ARG TARGETARCH=amd64
-ARG TARGETVARIANT=""
+FROM --platform=$BUILDPLATFORM golang:1.21-alpine AS build
+ARG TARGETPLATFORM
+ARG BUILDPLATFORM
+ARG TARGETOS
+ARG TARGETARCH
+ARG TARGETVARIANT
 ENV CGO_ENABLED=0
 ARG GOPROXY=https://goproxy.cn,direct
 ENV GOPROXY=$GOPROXY
@@ -10,7 +12,13 @@ RUN apk add --no-cache git
 COPY server/ ./server/
 COPY web/ ./web/
 WORKDIR /app/server
-RUN go env -w GOPROXY=$GOPROXY && GOOS=$TARGETOS GOARCH=$TARGETARCH GOARM=$(echo $TARGETVARIANT | sed 's/^v//') go build -o /app/bin/marketing-data-server ./cmd/server
+# 解析平台并执行交叉编译；arm 平台根据 variant 设置 GOARM
+RUN OS=${TARGETOS:-$(echo $TARGETPLATFORM | cut -d/ -f1)} \
+    && ARCH=${TARGETARCH:-$(echo $TARGETPLATFORM | cut -d/ -f2)} \
+    && VARIANT=${TARGETVARIANT:-$(echo $TARGETPLATFORM | cut -d/ -f3)} \
+    && if [ "$ARCH" = "arm" ]; then export GOARM=$(echo "$VARIANT" | sed 's/^v//;s/[^0-9]//g'); else export GOARM=; fi \
+    && go env -w GOPROXY=$GOPROXY \
+    && GOOS=$OS GOARCH=$ARCH go build -trimpath -ldflags="-s -w" -o /app/bin/marketing-data-server ./cmd/server
 
 FROM alpine:3.19
 WORKDIR /app