Update build.yml

Author: ggarbereder

.github/workflows/build.yml

@@ -31,4 +31,4 @@ jobs:
     - name: Setup Gradle
       uses: gradle/gradle-build-action@v2
     - name: Test with Gradle
-      run: cd Task-Tracker-Entities && ./gradlew test
+      run: cd Task-Tracker-Entities && chmod +x gradlew && ./gradlew test