incus-agent: Add support for template ownership/mode #409

Job	Run time
Documentation	6m 35s
Client (1.20.x, ubuntu-latest)	1m 14s
System (1.20.x, cluster, dir)	12m 28s
Client (1.20.x, macos-latest)	1m 20s
Code	7m 40s
System (1.20.x, cluster, btrfs)	13m 2s
Client (1.20.x, windows-latest)	2m 19s
System (1.20.x, cluster, lvm)	12m 29s
System (1.20.x, cluster, zfs)	12m 33s
System (1.20.x, cluster, ceph)	16m 7s
System (1.20.x, cluster, random)	13m 38s
System (1.20.x, standalone, dir)	21m 53s
System (1.20.x, standalone, btrfs)	23m 20s
System (1.20.x, standalone, lvm)	41m 18s
System (1.20.x, standalone, zfs)	43m 22s
System (1.20.x, standalone, ceph)	1h 13m 48s
System (1.20.x, standalone, random)	23m 50s
System (stable, cluster, dir)	12m 5s
System (stable, standalone, dir)	21m 51s
System (tip, cluster, dir)	11m 13s
System (tip, standalone, dir)	22m 4s
	6h 34m 9s

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