Add +x to gradlew

Author: PhilWakelin

.github/workflows/main.yml

@@ -28,7 +28,6 @@ jobs:
       - name: Build with Maven
         run: ./mvnw --batch-mode --update-snapshots --file pom.xml -Djava.version=${{ matrix.jdk }} verify      
 
-
   build-gradlew:
     name: Build Gradle Wrapper
 
@@ -45,6 +44,8 @@ jobs:
         distribution: 'semeru'
     - uses: gradle/actions/setup-gradle@v3
       with: 
-        gradle-version: 8.6
+        gradle-version: 8.6        
+    - name: Make gradlew executable
+      run: chmod +x ./gradlew
     - name: Build with Gradle
       run: ./gradlew clean build -Pjava_version=${{ matrix.jdk }}