Add thumbnails to rss feed

Author: seanyeh

layouts/blog/rss.xml

@@ -1,5 +1,5 @@
 {{ printf "<?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"yes\" ?>" | safeHTML }}
-<rss version="2.0">
+<rss version="2.0" xmlns:media="http://search.yahoo.com/mrss/">
     <channel>
         <title>Pulumi Blog</title>
         <link>{{ .Site.Params.canonicalURL }}{{ .RelPermalink }}</link>
@@ -13,6 +13,9 @@
                 <link>{{ .Site.Params.canonicalURL }}{{ .RelPermalink }}</link>
                 <pubDate>{{ .Date.Format "Mon, 02 Jan 2006 15:04:05 -0700" | safeHTML }}</pubDate>
                 <guid>{{ .Site.Params.canonicalURL }}{{ .RelPermalink }}</guid>
+                {{ if .Params.meta_image }}
+                    <media:content url="{{ .Site.Params.canonicalURL }}{{ .RelPermalink }}{{ .Params.meta_image }}" />
+                {{ end }}
                 <description>{{ .Content | html }}</description>
                 {{ range $id := .Params.authors }}
                     {{ $author := index $.Site.Data.team.team $id }}