Send an email to the user when a recording is done processing

Had to add an email attribute to users to store their email to send the
notification. Will only send it for user rooms since they are the only
ones we know who to notify.

app/controllers/bbb_controller.rb

@@ -170,9 +170,13 @@ class BbbController < ApplicationController
         rec_info = rec_info[:recordings].first
         RecordingCreatedJob.perform_later(token, parse_recording_for_view(rec_info))
 
+        # send an email to the owner of this recording, if defined
+        owner = User.find_by(encrypted_id: token)
+        RecordingReadyEmailJob.perform_later(owner) if owner.present?
+
         # TODO: remove the webhook now that the meeting and recording are done
         # remove only if the meeting is not running, otherwise the hook is needed
-        # if ENV['GREENLIGHT_USE_WEBHOOKS']
+        # if Rails.configuration.use_webhooks
         #   webhook_remove("#{base_url}/callback")
         # end
       else