Update Dockerfile to use Maven image with domestic repository settings for improved dependency download speed.

Dockerfile

@@ -1,8 +1,11 @@
-# ========== 阶段一：Maven 构建 ==========
-FROM eclipse-temurin:8-jdk-alpine AS builder
+# ========== 阶段一：Maven 构建（使用带 Maven 的镜像 + 国内源） ==========
+FROM maven:3.9-eclipse-temurin-8-alpine AS builder
 
 WORKDIR /build
 
+# 使用阿里云 Maven 镜像，加速依赖下载
+COPY docker/maven-settings.xml /root/.m2/settings.xml
+
 # 先只复制 pom，利用 Docker 缓存依赖层
 COPY pom.xml .
 RUN mvn dependency:go-offline -B -q

docker/maven-settings.xml

@@ -0,0 +1,49 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<settings xmlns="http://maven.apache.org/SETTINGS/1.2.0"
+          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+          xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.2.0 https://maven.apache.org/xsd/settings-1.2.0.xsd">
+  <mirrors>
+    <mirror>
+      <id>aliyun-public</id>
+      <mirrorOf>*</mirrorOf>
+      <name>阿里云公共仓库</name>
+      <url>https://maven.aliyun.com/repository/public</url>
+    </mirror>
+  </mirrors>
+  <profiles>
+    <profile>
+      <id>aliyun</id>
+      <repositories>
+        <repository>
+          <id>aliyun-public</id>
+          <url>https://maven.aliyun.com/repository/public</url>
+          <releases><enabled>true</enabled></releases>
+          <snapshots><enabled>true</enabled></snapshots>
+        </repository>
+        <repository>
+          <id>aliyun-central</id>
+          <url>https://maven.aliyun.com/repository/central</url>
+          <releases><enabled>true</enabled></releases>
+          <snapshots><enabled>false</enabled></snapshots>
+        </repository>
+        <repository>
+          <id>aliyun-spring</id>
+          <url>https://maven.aliyun.com/repository/spring</url>
+          <releases><enabled>true</enabled></releases>
+          <snapshots><enabled>false</enabled></snapshots>
+        </repository>
+      </repositories>
+      <pluginRepositories>
+        <pluginRepository>
+          <id>aliyun-public</id>
+          <url>https://maven.aliyun.com/repository/public</url>
+          <releases><enabled>true</enabled></releases>
+          <snapshots><enabled>true</enabled></snapshots>
+        </pluginRepository>
+      </pluginRepositories>
+    </profile>
+  </profiles>
+  <activeProfiles>
+    <activeProfile>aliyun</activeProfile>
+  </activeProfiles>
+</settings>