code: func (p *Pod) getAppsHashes() ([]types.Hash, error) {
  	apps, err := p.getApps()
  	if err != nil {
  		return nil, err
  	}
  
  	var hashes []types.Hash
  	for _, a := range apps {
  		hashes = append(hashes, a.Image.ID)
  	}
  
  	return hashes, nil
  }
docs: // getAppsHashes returns a list of the app hashes in the pod