Use single (cached) build for tests & release (#182) #131

Job	Run time
Check libraries	31s
ci-tests / Lint	27s
ci-tests / Unit tests	1m 15s
ci-tests / Build charms (.) / Collect platforms for charm \| .	18s
ci-tests / Build charms (tests/integration/app-charm) / Collect platforms for charm \| tests/integration/app-charm	18s
ci-tests / Build charms (.) / Build charm \| [email protected]:amd64	3m 7s
ci-tests / Build charms (tests/integration/app-charm) / Build charm \| [email protected]:amd64	2m 45s
ci-tests / integration-charm	28m 30s
ci-tests / integration-password-rotation	18m 33s
ci-tests / integration-provider	26m 31s
ci-tests / integration-tls	34m 16s
ci-tests / integration-upgrade	3m 0s
ci-tests / integration-backup	25m 53s
ci-tests / integration-replication	31m 3s
ci-tests / integration-scaling	54m 13s
ci-tests / integration-ha	27m 24s
Release to Charmhub / Release charm	49s
	4h 18m 53s

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