localhost in invitation urls

Hi,

I installed limesurvey via docker ( hub.docker.com/r/crramirez/limesurvey/ ).

I created a survey and generated some invitations. However the the invitation url looks like:

http://localhost/index.php/542122?token=4fxPDQGNgnpiV53&lang=de

I would like to change the url to something like

foo.example.org/index.php/542122?token=4fxPDQGNgnpiV53&lang=de

Where can I configure this?

I have version: Version 2.72.3+171020

Best regards
Thomas

I think I found a solution:
I edited config-defaults.php , I changed

$config = ' mywish-name.example.org/ ';

And now it seems to work.

Is it a good solution or is there something better?