       _             -> ""
     end
   end
+
+  def version_link(ver) do
+    nice = String.slice(ver, 0, 7)
+    "<https://github.com/ello/webapp/commit/#{ver}|#{nice}>"
+  end
 end

        attachments: [
          %{
            title: "New version published for all users on #{env}.",
            text:  "Version `#{ver}`",
            color: "good",
          }
        ]

        attachments: [
          %{
            title: "New version published for all users on #{env}.",
            text:  "Version #{version_link(ver)}",
            color: "good",
          },
          %{
            title: "Rollback",
            text: "Rollback version #{version_link(ver)} to #{version_link(previous)} on #{env}?",
            color: "warning",
            callback_id: "publish:webapp",
            actions: [
