refactor: urfave v2

cli/app/undeploy.go

@@ -14,13 +14,14 @@ import (
 	stack "coopcloud.tech/abra/pkg/upstream/stack"
 	"github.com/docker/docker/api/types/filters"
 	dockerClient "github.com/docker/docker/client"
-	"github.com/urfave/cli"
+	"github.com/urfave/cli/v2"
 )
 
 var prune bool
 
 var pruneFlag = &cli.BoolFlag{
-	Name:        "prune, p",
+	Name:        "prune",
+	Aliases:     []string{"p"},
 	Destination: &prune,
 	Usage:       "Prunes unused containers, networks, and dangling images for an app",
 }