feat: Add GitHub Actions workflow to update README with blog posts and expose teaser image in RSS feed.

Author: devbattery

feed.xml

@@ -18,6 +18,7 @@ layout: null
       <description>{{ post.excerpt | strip_html | truncatewords: 30 | xml_escape }}</description>
       {%- capture teaser_path -%}{% include auto-teaser-path.html post=post %}{%- endcapture -%}
       {%- assign teaser_url = teaser_path | strip | absolute_url -%}
+      <teaser_image>{{ teaser_url }}</teaser_image>
       <media:content url="{{ teaser_url }}" medium="image" />
       <enclosure url="{{ teaser_url }}" type="image/png" length="0" />
     </item>