fix: use full image tag to support podman

Dockerfile

@@ -6,7 +6,7 @@
 # =====================================================================
 
 # ---------- 构建阶段 ----------
-FROM maven:3.9-eclipse-temurin-21 AS build
+FROM docker.io/library/maven:3.9-eclipse-temurin-21 AS build
 WORKDIR /build
 
 # 先只复制 pom，利用 Docker 层缓存预热依赖
@@ -19,7 +19,7 @@ RUN mvn -B -q -Dmaven.test.skip=true package \
     && cp target/*.jar /build/app.jar
 
 # ---------- 运行阶段 ----------
-FROM eclipse-temurin:21-jre
+FROM docker.io/library/eclipse-temurin:21-jre
 WORKDIR /opt/app
 
 # 以非 root 用户运行

docker-compose.yml

@@ -16,7 +16,7 @@ name: lab-reservation
 services:
   # ---------- 数据库：MariaDB 11 ----------
   mariadb:
-    image: mariadb:11.4
+    image: docker.io/library/mariadb:11.4
     container_name: lab-mariadb
     restart: unless-stopped
     environment:
@@ -31,7 +31,7 @@ services:
       - --collation-server=utf8mb4_unicode_ci
     volumes:
       # 数据库数据持久化；首次启动由后端自动建表并写入演示数据
-      - mariadb-data:/var/lib/mysql
+      - ${DATA_DIR:-./mariadb-data}:/var/lib/mysql
     # 需要本地客户端连库调试时可打开端口映射
     # ports:
     #   - "3306:3306"
@@ -88,10 +88,6 @@ services:
     networks:
       - lab-net
 
-volumes:
-  # 命名卷保存 MariaDB 数据；docker compose down -v 可连同数据一起清理
-  mariadb-data:
-
 networks:
   lab-net:
     driver: bridge