after successful auth, add record to PluginStore if record doesn't already exist

plugin.rb

@@ -100,6 +100,9 @@ class OAuth2BasicAuthenticator < ::Auth::OAuth2Authenticator
       result.user = User.where(id: current_info[:user_id]).first
     elsif SiteSetting.oauth2_email_verified?
       result.user = User.where(email: Email.downcase(result.email)).first
+      if result.user && user_details[:user_id]
+        ::PluginStore.set("oauth2_basic", "oauth2_basic_user_#{user_details[:user_id]}", {user_id: result.user.id})
+      end
     end
 
     result.extra_data = { oauth2_basic_user_id: user_details[:user_id] }