If you want to copy the application image to another computer that has podman installed and run it there:
docker save -o generated-tar-file-path image-name
For example:
podman save -o ubuntu_10.5.0_x64_app.tar microfocus/extend-app:ubuntu_10.5.0_x64
podman load -i image-tar-file-path
For example:
docker load -i ubuntu_10.5.0_x64_app.tar