code: public void createTag(final String tagUrl, final String commitMessage)
              throws IOException, InterruptedException {
          build.getWorkspace()
                  .act(new SVNCreateTagCallable(tagUrl, commitMessage, getLocation(), getSvnAuthenticationProvider(build),
                          buildListener));
      }
docs: Creates a tag directly from the working copy.
  
  @param tagUrl        The URL of the tag to create.
  @param commitMessage Commit message
  @return The commit info upon successful operation.
  @throws IOException On IO of SVN failure