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lisa._kmod: Add fuse-overlayfs overlay backend

Douglas Raillard requested to merge douglas-raillard-arm/lisa:_pr0000079 into main

FEATURE

Add "fuse-overlayfs" backend in addition to the existing "overlayfs". This backend has much better performance than the "copy" backend even if it is itself worse than the native "overlayfs". However, it can come in handy in environments that:

  1. Don't allow user namespaces like some modern distribution (e.g. Ubuntu 24.04).
  2. Environments that don't allow overlayfs (and user namespaces) such as Docker containers.

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