fix: follow android 11 storage permissions (#66)

.github/workflows/build.yml

@@ -268,6 +268,7 @@ jobs:
           gomobile init
           gomobile bind -tags nosqlite -ldflags="-w -s" -o ui/flutter/android/app/libs/libgopeed.aar -target=android -androidapi 19 -javapkg=com.gopeed github.com/monkeyWie/gopeed/bind/mobile
           cd ui/flutter
+          echo $APK_KEYSTORE | base64 -d > android/app/upload-keystore.jks
           flutter build apk
           mkdir dist
           cp build/app/outputs/flutter-apk/app-release.apk dist/Gopeed-$VERSION-android.apk