Changes to the local menu are not working when using the dockerized version of netbootxyz

Webapp version : 0.6.9

I opened the webapp on port 3000 and changed something in the menus (e.g. about.ipxe)

I would expect to see my changes when I boot from the tftp the docker is providing.

But instead it shows me the original about.ipxe without my changes.

Is there some configuration in the docker container that I am missing ?