Hello! Yes indeed, but that is intentional. See my post here: Ditrobox ignores local podman image (toolbox is fine with it) - #2 by akarypid
For the application export though, it doesn’t really matter where you build your image. The export action is done from a container (not an image) to the host running that container. So you create from any image (wherever it came from), then create a container anywhere else (though that would require downloading the image to that host).
Either way, once you have a container, just use the command I referenced to enter the container and have it export the app (from the container to the host running it). It does not have to be part of the script that builds the image.