chore: build charm in independent workflow step (#128) #251

Job	Run time
Static analysis / static-analysis	28s
unit-tests-with-coverage / unit-tests	22s
lint-report / lint-report	22s
build / build-charm-under-test	4m 39s
integration-test / integration-test	5m 28s
publish-charm / publish-charm	1m 15s
	12m 34s

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