App crashed on startup on brick (Permission denied @ dir_s_mkdir - /app/data/gpx) — brick has SELinux enforcing, unlike cube, and Podman denies a container write access to a bind-mounted host directory without a relabel regardless of Unix permissions. Applied to both maptool's ./data mount and kiwix's ZIM mount (same underlying cause, would have hit this too once a real ZIM is placed there).