code: func (p *Pod) AppNameToImageName(appName types.ACName) types.ACIdentifier {
  	image, ok := p.Images[appName.String()]
  	if !ok {
  		// This should be impossible as we have updated the map in LoadPod().
  		panic(fmt.Sprintf("No images for app %q", appName.String()))
  	}
  	return image.Name
  }
docs: // AppNameToImageName takes the name of an app in the Pod and returns the name
  // of the app's image. The mapping between these two is populated when a Pod is
  // loaded (using LoadPod).