build(Dockerfile): 将基础镜像从scratch改为alpine并优化时区配置

简化时区配置，从仅复制上海时区改为复制全部时区数据
移除不必要的/etc目录复制

Dockerfile

@@ -24,11 +24,11 @@ RUN BUILD_TIME=$(date -u +"%Y-%m-%d %H:%M:%S") && \
     go build -ldflags="-s -w -X 'github.com/perfect-panel/server/pkg/constant.Version=${VERSION}' -X 'github.com/perfect-panel/server/pkg/constant.BuildTime=${BUILD_TIME}'" -o /app/ppanel ppanel.go
 
 # Final minimal image
-FROM scratch
+FROM alpine:latest
 
 # Copy CA certificates and timezone data
 COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
-COPY --from=builder /usr/share/zoneinfo/Asia/Shanghai /usr/share/zoneinfo/Asia/Shanghai
+COPY --from=builder /usr/share/zoneinfo /usr/share/zoneinfo
 
 ENV TZ=Asia/Shanghai
 
@@ -36,7 +36,6 @@ ENV TZ=Asia/Shanghai
 WORKDIR /app
 
 COPY --from=builder /app/ppanel /app/ppanel
-COPY --from=builder /build/etc /app/etc
 
 # Expose the port (optional)
 EXPOSE 8080