update README.md

.github/workflows/maven.yml

@@ -14,11 +14,22 @@ jobs:
       - uses: actions/checkout@v3
 
       - name: Set up JDK 21
-        uses: actions/setup-java@v3
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y openjdk-21-jdk
+          java -version
+
+      - name: Set up Maven
+        run: |
+          sudo apt-get install -y maven
+          mvn -version
+
+      - name: Cache Maven packages
+        uses: actions/cache@v3
         with:
-          java-version: '21'
-          distribution: 'temurin'
-          cache: maven
+          path: ~/.m2
+          key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
+          restore-keys: ${{ runner.os }}-m2
 
       - name: Build with Maven
         run: mvn -B compile