fix: more precise filtering

Closes coop-cloud/organising#305.

cli/app/ps.go

@@ -15,7 +15,6 @@ import (
 	"github.com/buger/goterm"
 	dockerFormatter "github.com/docker/cli/cli/command/formatter"
 	"github.com/docker/docker/api/types"
-	"github.com/docker/docker/api/types/filters"
 	dockerClient "github.com/docker/docker/client"
 	"github.com/sirupsen/logrus"
 	"github.com/urfave/cli"
@@ -67,8 +66,10 @@ var appPsCommand = cli.Command{
 
 // showPSOutput renders ps output.
 func showPSOutput(c *cli.Context, app config.App, cl *dockerClient.Client) {
-	filters := filters.NewArgs()
-	filters.Add("name", app.StackName())
+	filters, err := app.Filters()
+	if err != nil {
+		logrus.Fatal(err)
+	}
 
 	containers, err := cl.ContainerList(context.Background(), types.ContainerListOptions{Filters: filters})
 	if err != nil {