Tests

Tests #864

Job	Run time
Unit tests	2m 32s
Check libraries	30s
Lint	18s
Build charms / Get workflow version / Get workflow version	4s
Build charms / Collect charms	12s
Build charms / Build mongodb charm \| 22.04	4m 34s
Build charms / Build application charm \| 20.04	3m 0s
charm-integration	13m 56s
ha-integration	53m 30s
relation-integration	20m 41s
legacy-integration	7m 50s
tls-integration	23m 13s
backup-integration	40m 43s
metric-integration	18m 38s
	3h 9m 41s

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