code: public GitlabTag getTag(GitlabProject project, String tagName) throws IOException {
          String tailUrl = GitlabProject.URL + "/" + project.getId() + GitlabTag.URL + "/" + tagName;
          return retrieve().to(tailUrl, GitlabTag.class);
      }
docs: Get a single repository tag in a specific project
  
  @param project (required) The ID or URL-encoded path of the project
  @param tagName (required) The name of the tag
  @return the found git tag object
  @throws IOException on gitlab api call error