Add :omniauthable to User model's devise declarations (required for Google SSO)

app/models/user.rb

@@ -71,7 +71,7 @@ class User < ApplicationRecord
   has_many :encrypted_configs, dependent: :destroy, class_name: 'EncryptedUserConfig'
   has_many :email_messages, dependent: :destroy, foreign_key: :author_id, inverse_of: :author
 
-  devise :two_factor_authenticatable, :recoverable, :rememberable, :validatable, :trackable, :lockable
+  devise :two_factor_authenticatable, :recoverable, :rememberable, :validatable, :trackable, :lockable, :omniauthable
 
   attribute :role, :string, default: ADMIN_ROLE
   attribute :uuid, :string, default: -> { SecureRandom.uuid }