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In some code I'm writing I want to be able to cleanly test if an image exists, as distinguished from other errors like authentication problems, network flakes etc. As best I can tell, the containers/image abstraction doesn't offer a clean way to do this. For now, I chose the route of adding the ugly string error matching here for the two cases I care about (docker v2s2 registry and oci directories), so my Rust code can operate in terms of clean `Option<Image>`. Signed-off-by: Colin Walters <walters@verbum.org>