ci(gitea): 更新构建测试工作流

- 将 checkout动作升级到 v4 版本
- 添加设置 JDK 17 环境步骤
- 修改 Maven 构建命令，去掉 ./mvnw
- 移除 Docker 构建步骤

.gitea/workflows/build-test.yaml

@@ -9,9 +9,14 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout Git Repo
-        uses: https://git.alina-dace.info/actions/checkout@40a16ebeed7da831425b665e600750cb36b38d06
+        uses: https://git.alina-dace.info/actions/checkout@v4
       - run: pwd
-      - run: chmod +x ./mvnw
+      - name: Set up JDK 17
+        uses: https://git.alina-dace.info/actions/setup-java@v4
+        with:
+          java-version: '17'
+          distribution: 'temurin'
+          cache: maven
       - name: build
-        run: ./mvnw clean package -DskipTests=true -P prod
+        run: mvn clean package -DskipTests=true -P prod
       - run: docker build sakura-miki:latest