add the app url input on the first setup page

lib/docuseal.rb

@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+module Docuseal
+  DEFAULT_APP_URL = 'http://localhost:3000'
+
+  module_function
+
+  def default_url_options
+    @default_url_options ||= begin
+      value = EncryptedConfig.find_by(key: EncryptedConfig::APP_URL_KEY)&.value
+      value ||= DEFAULT_APP_URL
+      url = Addressable::URI.parse(value)
+      { host: url.host, port: url.port, protocol: url.scheme }
+    end
+  end
+
+  def refresh_default_url_options!
+    @default_url_options = nil
+  end
+end