Add a seed for better randomness

Without the seed the rand.Intn will always start from the same place and
return the same application name

Signed-off-by: Djordje Lukic <djordje.lukic@docker.com>

cmd/cnab-run/main.go

@@ -3,7 +3,9 @@ package main
 import (
 	"errors"
 	"fmt"
+	"math/rand"
 	"os"
+	"time"
 
 	"github.com/docker/app/internal"
 )
@@ -38,6 +40,7 @@ func getCnabAction() (cnabAction, string, error) {
 }
 
 func main() {
+	rand.Seed(time.Now().UnixNano())
 	action, actionName, err := getCnabAction()
 	if err != nil {
 		fmt.Fprintf(os.Stderr, "Error while parsing CNAB operation: %s", err)

cmd/docker-app/main.go

@@ -1,6 +1,9 @@
 package main
 
 import (
+	"math/rand"
+	"time"
+
 	"github.com/docker/app/internal"
 	app "github.com/docker/app/internal/commands"
 	"github.com/docker/cli/cli-plugins/manager"
@@ -10,6 +13,7 @@ import (
 )
 
 func main() {
+	rand.Seed(time.Now().UnixNano())
 	plugin.Run(func(dockerCli command.Cli) *cobra.Command {
 		cmd := app.NewRootCmd("app", dockerCli)
 		originalPreRun := cmd.PersistentPreRunE