Make persistence provider pluggable at runtime

persistence/db_ledis/wire_providers.go

@@ -15,4 +15,5 @@ var Set = wire.NewSet(
 	NewCheckSumRepository,
 	NewNowPlayingRepository,
 	persistence.NewMediaFolderRepository,
+	wire.Value(persistence.ProviderIdentifier("levisdb")),
 )

persistence/db_storm/wire_providers.go

@@ -15,4 +15,5 @@ var Set = wire.NewSet(
 	NewCheckSumRepository,
 	persistence.NewNowPlayingRepository,
 	persistence.NewMediaFolderRepository,
+	wire.Value(persistence.ProviderIdentifier("storm")),
 )

persistence/persistence.go

@@ -0,0 +1,3 @@
+package persistence
+
+type ProviderIdentifier string