Add 'setup-java' step to all examples

setup-gradle/README.md

@@ -19,6 +19,11 @@ jobs:
     steps:
     - name: Checkout sources
       uses: actions/checkout@v4
+    - name: Setup Java
+      uses: actions/setup-java@v4
+      with:
+        distribution: 'temurin'
+        java-version: 17
     - name: Setup Gradle
       uses: gradle/actions/setup-gradle@v3
     - name: Build with Gradle