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Pull manifests and container configs concurrently in PullBaseImages when building multi-platform images
Currently, PullBaseImages iterates over a manifest list and downloads manifests sequentially.
https://github.com/GoogleContainerTools/jib/blob/94f8bdafe0f816c548f96392b34660d5574cc5c4/jib-core/src/main/java/com/google/cloud/tools/jib/builder/steps/PullBaseImageStep.java#L239