rn: add support for alpha.jitsi.net

android/app/src/main/AndroidManifest.xml

         <action android:name="android.intent.action.VIEW" />
         <category android:name="android.intent.category.BROWSABLE" />
         <category android:name="android.intent.category.DEFAULT" />
+        <data android:host="alpha.jitsi.net" android:scheme="https" />
         <data android:host="beta.meet.jit.si" android:scheme="https" />
         <data android:host="meet.jit.si" android:scheme="https" />
       </intent-filter>

ios/app/app.entitlements

 <dict>
 	<key>com.apple.developer.associated-domains</key>
 	<array>
+		<string>applinks:alpha.jitsi.net</string>
 		<string>applinks:beta.meet.jit.si</string>
 		<string>applinks:meet.jit.si</string>
 	</array>

ios/app/src/AppDelegate.m

 
     jitsiMeet.conferenceActivityType = JitsiMeetConferenceActivityType;
     jitsiMeet.customUrlScheme = @"org.jitsi.meet";
-    jitsiMeet.universalLinkDomains = @[@"meet.jit.si", @"beta.meet.jit.si"];
+    jitsiMeet.universalLinkDomains = @[@"meet.jit.si", @"alpha.jitsi.net", @"beta.meet.jit.si"];
 
     jitsiMeet.defaultConferenceOptions = [JitsiMeetConferenceOptions fromBuilder:^(JitsiMeetConferenceOptionsBuilder *builder) {
         builder.serverURL = [NSURL URLWithString:@"https://meet.jit.si"];

react/features/base/known-domains/reducer.js

  * out of the Andorid manifest.
  */
 export const DEFAULT_STATE = [
+    'alpha.jitsi.net',
     'beta.meet.jit.si',
     'meet.jit.si',
     '8x8.vc'