Add runs-on setting for workflow (#292) #7

Job	Run time
ci-tests / Check libraries	32s
ci-tests / Lint	17s
Build charm / Get workflow version / Get workflow version	5s
ci-tests / Unit tests	2m 26s
ci-tests / Build tests/integration/relation_tests/new_relations/application-charm charm / Get workflow version / Get workflow version	10s
ci-tests / Build . charm / Get workflow version / Get workflow version	8s
Build charm / Build charm	3m 47s
ci-tests / Build . charm / Build charm	5m 9s
ci-tests / Build tests/integration/relation_tests/new_relations/application-charm charm / Build charm	3m 3s
ci-tests / charm-integration	10m 48s
ci-tests / ha-integration	54m 49s
ci-tests / relation-integration	21m 51s
ci-tests / legacy-integration	3m 12s
ci-tests / tls-integration	27m 10s
ci-tests / backup-integration	1h 18m 20s
ci-tests / metric-integration	19m 38s
Release charm / Get workflow version / Get workflow version	9s
Release charm / Release charm	40s
Release libraries	31s
	3h 52m 45s

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