def add_repository_tag
      return unless @options.key?(:tag)
      repo, repo_tag = @options[:tag].split(':', 2)
      @image.tag(repo: repo, tag: repo_tag, force: true)
    end
def add_repository_tag
      return unless @options.key?(:tag)
      repo, repo_tag = @options[:tag].split(':', 2)
      @image.tag(repo: repo, tag: repo_tag, force: true)
    end
Adds a repository name and a tag to the Docker image.

 @return void

 @api private