incusd/apparmor/rsync: Fix in nested containers #253

Job	Run time
Documentation	8m 49s
Code	6m 27s
Client (1.20.x, ubuntu-latest)	1m 9s
Client (1.20.x, macos-latest)	43s
System (1.20.x, cluster, dir)	13m 14s
Client (1.20.x, windows-latest)	2m 29s
System (1.20.x, cluster, btrfs)	12m 16s
System (1.20.x, cluster, lvm)	12m 56s
System (1.20.x, cluster, zfs)	13m 7s
System (1.20.x, cluster, ceph)	15m 58s
System (1.20.x, cluster, random)	14m 16s
System (1.20.x, standalone, dir)	22m 40s
System (1.20.x, standalone, btrfs)	21m 57s
System (1.20.x, standalone, lvm)	39m 8s
System (1.20.x, standalone, zfs)	32m 36s
System (1.20.x, standalone, ceph)	1h 12m 37s
System (1.20.x, standalone, random)	24m 6s
System (stable, cluster, dir)	12m 40s
System (stable, standalone, dir)	23m 1s
System (tip, cluster, dir)	12m 40s
System (tip, standalone, dir)	22m 14s
	6h 25m 3s

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