Currently, when checkpoint or restore fails, runc diagnostics is inadequate, as the error itself is hiding in criu logs. This is why we have something like

		grep -B 5 Error "$workdir"/*.log ./image-dir/*.log || true

all across the https://github.com/opencontainers/runc/blob/main/tests/integration/checkpoint.bats

Perhaps we can implement something like this in runc itself, so it will show something useful in case of error.