Jekyll loop component to loop posts of a given tag

loop.html

<ul class="post-loop">
{% assign post_exp = "post.tags contains '" | append: include.tag | append: "'" %}
{% assign posts = site.posts | where_exp: "post", post_exp %}
{% for post in posts %}
  <li><a class="post-title" href="{{ site.baseurl }}{{ post.url }}">{{ post.title }} <small class="post-date">{{ post.date | date_to_string }}</small></a></li>
{% endfor %}
</ul>