refac: decouple persistence and image storage behind driver registries

test/media_purge_scheduler_test.go

@@ -31,7 +31,7 @@ type schedulerEnv struct {
 func newSchedulerEnv(t *testing.T) *schedulerEnv {
 	t.Helper()
 	env := newPurgeEnv(t)
-	merge := useCases.NewMergeMediaUseCase(env.images, env.articles)
+	merge := useCases.NewMergeMediaUseCase(env.images, env.articles, env.storage)
 	now := func() time.Time { return env.clock }
 	runPurge := useCases.NewRunPurgeUseCase(env.images, env.articles, merge, env.purgeSettings, now, log.New(env.logs, "", 0))
 	return &schedulerEnv{