Add check to make sure releases actually was updated (#12791)

.circleci/update-releases.sh

@@ -5,3 +5,6 @@ IFS=$'\n\t'
 curl -X POST \
 -H "X-Update-Token: ${UPDATE_TOKEN}" \
 https://releases.rocket.chat/update
+
+# Makes build fail if the release isn't there
+curl --fail https://releases.rocket.chat/$CIRCLE_TAG/info