Add validation and fillable fields

Signed-off-by: snipe <snipe@snipe.net>

app/Models/Setting.php

@@ -76,6 +76,7 @@ class Setting extends Model
           'audit_interval'                      => 'numeric|nullable',
           'custom_forgot_pass_url'              => 'url|nullable',
           'privacy_policy_link'                 => 'nullable|url',
+          'google_redirect'                 => 'nullable|url',
     ];
 
     protected $fillable = [
@@ -86,6 +87,10 @@ class Setting extends Model
         'webhook_endpoint',
         'webhook_channel',
         'webhook_botname',
+        'google_login',
+        'google_client_id',
+        'google_client_secret',
+        'google_redirect',
     ];
 
     /**