fix: setup lxd with group "lxd" in GH actions #4678

Job	Run time
Canonical CLA signed and Signed-off-by (DCO)	13s
check-inclusive-naming	5s
e2e-tests (5.0/edge, chromium)	10m 59s
js-tests	1m 1s
e2e-tests (5.0/edge, firefox)	16m 39s
lint	1m 15s
e2e-tests (5.21/edge, chromium)	13m 38s
e2e-tests (5.21/edge, firefox)	17m 4s
e2e-tests (latest/edge, chromium)	14m 14s
e2e-tests (latest/edge, firefox)	20m 46s
merge-e2e-reports	19s
	1h 36m 13s

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