Update main.yml

.github/workflows/main.yml

@@ -10,5 +10,5 @@ jobs:
     steps:
       - uses: actions/checkout@v1
       - name: setup-android
-        run: chmod 551 gradlew & ./gradlew build -x mirai-core:jvmTest
+        run: chmod 777 gradlew & ./gradlew build -x mirai-core:jvmTest