incusd/cluster: Actually use YAML for resources cache #688

Job	Run time
Client (oldstable, ubuntu-latest)	19s
System (stable, cluster, dir)	12m 11s
Client (oldstable, macos-latest)	37s
Code (oldstable)	7m 29s
Client (oldstable, windows-latest)	1m 36s
System (stable, cluster, btrfs)	11m 51s
Documentation	6m 11s
Code (stable)	7m 26s
Client (stable, ubuntu-latest)	22s
System (stable, cluster, lvm)	14m 28s
Code (tip)	10m 19s
System (stable, cluster, zfs)	13m 3s
Client (stable, macos-latest)	41s
System (stable, cluster, ceph)	17m 41s
Client (stable, windows-latest)	1m 39s
System (stable, cluster, random)	13m 7s
System (stable, standalone, dir)	22m 40s
System (stable, standalone, btrfs)	22m 9s
System (stable, standalone, lvm)	39m 28s
System (stable, standalone, zfs)	38m 12s
System (stable, standalone, ceph)	28m 23s
System (stable, standalone, random)	36m 40s
System (oldstable, cluster, dir)	12m 55s
System (oldstable, standalone, dir)	24m 11s
System (tip, cluster, dir)	14m 29s
System (tip, standalone, dir)	25m 5s
	6h 23m 12s

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