Flutter Release configuraton for ios

AppDelegate.swift

import UIKit
import Flutter
import GoogleMaps

@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
    override func application(
        _ application: UIApplication,
        didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
    ) -> Bool {
        // Add GoogleMapsAPIKey to reference MAPS_API_KEY in Info.plist
        GMSServices.provideAPIKey(infoForKey("GoogleMapsAPIKey")!)
        GeneratedPluginRegistrant.register(with: self)
        return super.application(application, didFinishLaunchingWithOptions: launchOptions)
    }
    
    func infoForKey(_ key: String) -> String? {
        return (Bundle.main.infoDictionary?[key] as? String)
    }
}

Debug.xcconfig

// ios/Flutter

APP_NAME = Debug App Name

#include "DebugMaps.xcconfig"

FLUTTER_TARGET_BUILD_MAIN = ${FLUTTER_APPLICATION_PATH}/lib/main_staging.dart
PRODUCT_BUNDLE_IDENTIFIER_BUILD = com.example.staging

#include "Pods/Target Support Files/Pods-Runner/Pods-Runner.debug.xcconfig"
#include "Generated.xcconfig"

GoogleService-Info-production.plist

// This file is inside root project

GoogleService-Info-staging.plist

// This file is inside root project

Release.xcconfig

// ios/Flutter

APP_NAME = Release App Name

#include "ReleaseMaps.xcconfig"

FLUTTER_TARGET_BUILD_MAIN = ${FLUTTER_APPLICATION_PATH}/lib/main_production.dart
PRODUCT_BUNDLE_IDENTIFIER_BUILD = com.example

#include "Pods/Target Support Files/Pods-Runner/Pods-Runner.release.xcconfig"
#include "Generated.xcconfig"

setup-ios-production.sh

#!/bin/bash

# Copy and rename correspond GoogleService-Info.plist to real path
cp GoogleService-Info-production.plist GoogleService-Info.plist
mv GoogleService-Info.plist ios/Runner/GoogleService-Info.plist

setup-ios-staging.sh

#!/bin/bash

# Copy and rename correspond GoogleService-Info.plist to real path
cp GoogleService-Info-staging.plist GoogleService-Info.plist
mv GoogleService-Info.plist ios/Runner/GoogleService-Info.plist