chore: Upgrade rails and ruby versions (#2400)

ruby version: 3.0.2
rails version: 6.1.4

config/initializers/facebook_messenger.rb

@@ -0,0 +1,49 @@
+# ref: https://github.com/jgorset/facebook-messenger#make-a-configuration-provider
+class ChatwootFbProvider < Facebook::Messenger::Configuration::Providers::Base
+  def valid_verify_token?(_verify_token)
+    ENV['FB_VERIFY_TOKEN']
+  end
+
+  def app_secret_for(_page_id)
+    ENV['FB_APP_SECRET']
+  end
+
+  def access_token_for(page_id)
+    Channel::FacebookPage.where(page_id: page_id).last.page_access_token
+  end
+
+  private
+
+  def bot
+    Chatwoot::Bot
+  end
+end
+
+Rails.application.reloader.to_prepare do
+  Facebook::Messenger.configure do |config|
+    config.provider = ChatwootFbProvider.new
+  end
+
+  Facebook::Messenger::Bot.on :message do |message|
+    Rails.logger.info "MESSAGE_RECIEVED #{message}"
+    response = ::Integrations::Facebook::MessageParser.new(message)
+    ::Integrations::Facebook::MessageCreator.new(response).perform
+  end
+
+  Facebook::Messenger::Bot.on :delivery do |delivery|
+    # delivery.ids       # => 'mid.1457764197618:41d102a3e1ae206a38'
+    # delivery.sender    # => { 'id' => '1008372609250235' }
+    # delivery.recipient # => { 'id' => '2015573629214912' }
+    # delivery.at        # => 2016-04-22 21:30:36 +0200
+    # delivery.seq       # => 37
+    updater = Integrations::Facebook::DeliveryStatus.new(delivery)
+    updater.perform
+    Rails.logger.info "Human was online at #{delivery.at}"
+  end
+
+  Facebook::Messenger::Bot.on :message_echo do |message|
+    Rails.logger.info "MESSAGE_ECHO #{message}"
+    response = ::Integrations::Facebook::MessageParser.new(message)
+    ::Integrations::Facebook::MessageCreator.new(response).perform
+  end
+end