With additional stores there is a risk that you could have
multiple images with the same name. IE An older image in a
read/only store versus a newer version in the read/write store.
This patch will ignore multiple images with the same name iff
one is read/write and all of the others are read/only.
Fixes: https://github.com/containers/podman/issues/8176
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>