Show an error page when rebuild

I suppose that the inner NGINX could have a 502 rule to serve a page like this:

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="refresh" content="5">
</head>
<body>
The Discourse server is starting up, please wait.....
</body>
</html>

Because if you can see that page at all, it means that the container is running and Unicorn is unreachable.

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