Sync UM role during Gravity user registration

gistfile1.php

/* This code will update the user registered with gravity 
form and allow you to give him a specific UM community role */

add_action("gform_user_registered", "um_gravity_user_role_sync", 88, 4);
function um_gravity_user_role_sync($user_id, $config, $entry, $user_pass) {

    update_user_meta($user_id, 'role', 'member'); // member can be your UM role slug

}