It seems podman system migrate is sometimes needed to upgrade
the file formats or the directory structure of the files stored by podman. (I assume the changes happen under the directory ~/.local/share/containers/)
Is there a command that can tell me whether running podman system migrate is necessary?
This question is about rootless use of podman (i.e. running podman as a normal user).
as rootless user, you need to run it every time the user namespace configuration is changed (e.g. you add more ids to /etc/subuid and /etc/subgid) and you want podman to recreate the user namespace