Additional Config Store Cleanup (#16440)

This change addresses a few issues where config stores were not
properly closed when an error was encountered on server startup.
This could result in leaked database connections when dealing with
a database config store.

config/database.go

@@ -48,6 +48,12 @@ func NewDatabaseStore(dsn string) (ds *DatabaseStore, err error) {
 		return nil, errors.Wrapf(err, "failed to connect to %s database", driverName)
 	}
 
+	defer func() {
+		if err != nil {
+			db.Close()
+		}
+	}()
+
 	ds = &DatabaseStore{
 		driverName:     driverName,
 		originalDsn:    dsn,
@@ -55,7 +61,8 @@ func NewDatabaseStore(dsn string) (ds *DatabaseStore, err error) {
 		db:             db,
 	}
 	if err = initializeConfigurationsTable(ds.db); err != nil {
-		return nil, errors.Wrap(err, "failed to initialize")
+		err = errors.Wrap(err, "failed to initialize")
+		return nil, err
 	}
 
 	return ds, nil

config/store.go

@@ -54,7 +54,13 @@ func NewStore(dsn string, watch bool, customDefaults *model.Config) (*Store, err
 		return nil, err
 	}
 
-	return NewStoreFromBacking(backingStore, customDefaults)
+	store, err := NewStoreFromBacking(backingStore, customDefaults)
+	if err != nil {
+		backingStore.Close()
+		return nil, errors.Wrap(err, "failed to create store")
+	}
+
+	return store, nil
 }
 
 func NewStoreFromBacking(backingStore BackingStore, customDefaults *model.Config) (*Store, error) {