singularity
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add extfs overlay to OCI-SIF via `singularity overlay`
The singularity overlay create
command should be extended to add an extfs overlay to an OCI-SIF image, in a similar way as is done for a native mode SIF.
The overlay added to the OCI-SIF should be included in an updated image manifest / config, with content-hashes that are consistent for the initial state of the overlay.