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overlay seal and conversion in `singularity push` of OCI-SIF as tar layers
When an OCI-SIF image is push
-ed to an OCI registry, and it is requested to use the tar layer format (#2848) then overlays must be handled as part of the push process:
- An extfs overlay must be sealed (#2870) into a read-only layer.
- The layer must be pushed in tar format.