Only install and refresh lxd once (#73) #348

Job	Run time
Test default addons are enabled by microk8s provider.	4m 7s
Test microk8s classic (ubuntu-20.04, 1.28/stable)	6m 15s
Inclusive-naming-check	10s
Test microk8s classic (ubuntu-20.04, latest/stable)	6m 13s
Test lxd environment (ubuntu-20.04, 2.9)	7m 11s
Test microk8s classic (ubuntu-22.04, 1.28/stable)	6m 42s
Test lxd environment (ubuntu-20.04, 3.1)	7m 12s
Test microk8s strict (ubuntu-20.04, 1.28-strict/stable)	6m 39s
Test microk8s classic (ubuntu-22.04, latest/stable)	6m 25s
Test lxd environment (ubuntu-20.04, 3.3)	6m 18s
Test microk8s strict (ubuntu-20.04, 1.27-strict/stable)	6m 29s
Test microstack environment	5m 33s
Test lxd environment (ubuntu-22.04, 2.9)	6m 49s
Test microk8s strict (ubuntu-22.04, 1.28-strict/stable)	6m 46s
Test lxd environment (ubuntu-22.04, 3.1)	7m 0s
Test microk8s strict (ubuntu-22.04, 1.27-strict/stable)	7m 10s
Test lxd environment (ubuntu-22.04, 3.3)	7m 17s
Test microk8s next to lxd (ubuntu-20.04)	5m 38s
Test vSphere environment	22m 38s
Test microk8s next to lxd (ubuntu-22.04)	5m 50s
	2h 18m 22s

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