Println Java version.

Author: donbeave

.github/workflows/build.yml

@@ -18,6 +18,7 @@ jobs:
 #          path: ~/.gradle/caches
 #          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle.kts') }}
 #          restore-keys: ${{ runner.os }}-gradle
+      - run: java --version
       - name: Spotless Check
         run: ./gradlew spotlessCheck
       - name: Test