Add DisableSameLayerUnpack option to cri config #16
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This change adds a new option named DisableSameLayerUnpack that stops Containerd from being able to unpack the same layer in parallel. This is most common if a pull of the same image is performed at the same time or different images that share layers being pulled at the same time.
This change relies on kevpar/containerd#33 landing to make use of the containerd.WithDisableSameLayerUnpack() option so I've left it as a draft for now to avoid an accidental merge but this is free to review.