treeForPublic(tree) {
    if (!tree) {
      return tree;
    }

    return new Funnel(tree, {
      srcDir: '/',
      destDir: `/${this.moduleName()}`,
      annotation: `Addon#treeForPublic (${this.name})`,
    });
  }
Returns the tree for all public files

    @public
    @method treeForPublic
    @param {Tree} tree
    @return {Tree} Public file tree