User seed migration authenticates admin user

Sends invitation, accepts invitation.

Now you can log in with `[email protected]` and `password`.

db/seeds/001_users.rb

@@ -1,10 +1,18 @@
 # frozen_string_literal: true
 
-User.find_or_create_by!(
-  email: '[email protected]'
-) do |user|
-  user.password = 'password'
-  user.password_confirmation = 'password'
-end.update!(
-  role: :root
-)
+module UserSeeder
+  module_function
+
+  def run
+    user = User.find_or_create_by!(email: '[email protected]') do |u|
+      u.password = 'password'
+      u.password_confirmation = 'password'
+      u.role = :root
+    end
+
+    user.invite!
+    user.accept_invitation!
+  end
+end
+
+UserSeeder.run