[WIP] nydusify: fix invalid blob digests for copy

[imeoer]

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• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
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• [ ] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes.

[github-actions[bot]]

This PR is stale because it has been open 60 days with no activity.

[github-actions[bot]]

This PR was closed because it has been stalled for 7 days with no activity.