feat: debug logging

Closes coop-cloud/organising#164.

cli/app/new.go

@@ -197,6 +197,7 @@ func action(c *cli.Context) error {
 	if len(sanitisedAppName) > 45 {
 		logrus.Fatalf("'%s' cannot be longer than 45 characters", sanitisedAppName)
 	}
+	logrus.Debugf("'%s' sanitised as '%s' for new app", newAppName, sanitisedAppName)
 
 	if err := config.CopyAppEnvSample(recipe.Name, newAppName, newAppServer); err != nil {
 		logrus.Fatal(err)