only register signal handling once

Signed-off-by: Jörn Friedrich Dreyer <jfd@butonic.de>

ocis/pkg/command/root.go

@@ -28,6 +28,6 @@ func Execute() error {
 		)
 	}
 
-	ctx, _ := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
+	ctx, _ := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM, syscall.SIGQUIT, syscall.SIGHUP)
 	return app.RunContext(ctx, os.Args)
 }