podman/docs/source/markdown/options/image-volume.md

--image-volume=bind | tmpfs | ignore

Tells Podman how to handle the builtin image volumes. Default is bind.

• bind: An anonymous named volume will be created and mounted into the container.
• tmpfs: The volume is mounted onto the container as a tmpfs, which allows the users to create content that disappears when the container is stopped.
• ignore: All volumes are just ignored and no action is taken.