fix: close metadb on shutdown (#3277)

Fixes https://github.com/project-zot/helm-charts/issues/70

Signed-off-by: Ramkumar Chinchani <rchincha.dev@gmail.com>

pkg/api/controller.go

@@ -455,12 +455,18 @@ func (c *Controller) LoadNewConfig(newConfig *config.Config) {
 }
 
 func (c *Controller) Shutdown() {
+	// stop all background tasks
 	c.StopBackgroundTasks()
 
 	if c.Server != nil {
 		ctx := context.Background()
 		_ = c.Server.Shutdown(ctx)
 	}
+
+	// close metadb
+	if c.MetaDB != nil {
+		c.MetaDB.Close()
+	}
 }
 
 // Will stop scheduler and wait for all tasks to finish their work.