Android fix (#7099)

* Fix android notifications permission

* fix unsigned android build

android/app/src/main/AndroidManifest.xml

@@ -12,6 +12,7 @@
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
     <uses-permission android:name="android.permission.RECORD_AUDIO" />
     <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
+    <uses-permission android:name="android.permission.POST_NOTIFICATIONS"/>
 
     <!-- Request legacy Bluetooth permissions on older devices. -->
     <uses-permission android:name="android.permission.BLUETOOTH"

android/app/src/unsigned/java/com/mattermost/flipper/ReactNativeFlipper.java

@@ -0,0 +1,19 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * <p>This source code is licensed under the MIT license found in the LICENSE file in the root
+ * directory of this source tree.
+ */
+package com.mattermost.flipper;
+
+import android.content.Context;
+import com.facebook.react.ReactInstanceManager;
+/**
+ * Class responsible of loading Flipper inside your React Native application. This is the release
+ * flavor of it so it's empty as we don't want to load Flipper.
+ */
+public class ReactNativeFlipper {
+    public static void initializeFlipper(Context context, ReactInstanceManager reactInstanceManager) {
+        // Do nothing as we don't want to initialize Flipper on Release.
+    }
+}