Fix: Make Gradle wrapper executable in CI workflow

Author: djtester0013

.github/workflows/gradle.yml

@@ -35,6 +35,9 @@ jobs:
       with:
         cache-disabled: true
 
+    - name: Make Gradle wrapper executable
+      run: chmod +x ./gradlew
+
     - name: Build with Gradle Wrapper
       run: ./gradlew build