fix: more precise filtering

Closes coop-cloud/organising#305.

cli/app/cp.go

@@ -111,7 +111,7 @@ func configureAndCp(
 	}
 
 	filters := filters.NewArgs()
-	filters.Add("name", fmt.Sprintf("%s_%s", app.StackName(), service))
+	filters.Add("name", fmt.Sprintf("^%s_%s", app.StackName(), service))
 
 	container, err := container.GetContainer(context.Background(), cl, filters, internal.NoInput)
 	if err != nil {