[docker-29.x backport] c8d/builder-next: Don't force unpack #51514
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backport: c8d/builder-next: Don't force unpack #51493
related to:
docker build --pushalways unpacks into moby snapshotter #51442c8d/builder-next: Don't force unpack
The image exporter wrapper was unconditionally setting
unpack=trueforall build exports, preventing users from controlling this behavior
through buildkit's output image exporter option.