Add email subscriptions (#38163)

app/controllers/email_subscriptions/confirmations_controller.rb

@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+class EmailSubscriptions::ConfirmationsController < ApplicationController
+  layout 'auth'
+
+  before_action :set_email_subscription
+
+  def show
+    @email_subscription.confirm! unless @email_subscription.confirmed?
+  end
+
+  private
+
+  def set_email_subscription
+    @email_subscription = EmailSubscription.find_by!(confirmation_token: params[:confirmation_token])
+  end
+end