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b042abc71c
If the magical io.github.containers.DeltaUrl label is set in the index, then try to download this to use as the delta manifest for the image. This allows servers to store deltas outside the registry itself. The label is propagated to the xa.delta-url metadata in the generated "fake summary" for the remote, and read back on pull. Note that the delta manifest layers descriptor will need to have a "urls" key where it references the blobs if the blobs are also not stored on the registry. If the specified manifest doesn't exist or doesn't apply to the target image we fall back to resolving via the _deltaindex tag.