<p>So I think I've figured it out now and the images from the hub it is using are:</p>

<ul>
<li>
<code>ruby:2.3.1-slim</code> which is the 2.3.1-slim tag from <a href="https://hub.docker.com/_/ruby/">https://hub.docker.com/_/ruby/</a>
</li>
<li>
<code>postgres:9.4</code> which is the 9.4 tag from <a href="https://hub.docker.com/_/postgres/">https://hub.docker.com/_/postgres/</a>
</li>
</ul>

<p>Which seems reasonable I guess.</p>

<p style="font-size:small;-webkit-text-size-adjust:none;color:#666;">—<br />You are receiving this because you are subscribed to this thread.<br />Reply to this email directly, <a href="https://github.com/openstreetmap/openstreetmap-website/pull/1290#issuecomment-247540096">view it on GitHub</a>, or <a href="https://github.com/notifications/unsubscribe-auth/ABWnLd10dqD9jr_3UVNAYfAWTnxuYBrFks5qqkrogaJpZM4J-dnj">mute the thread</a>.<img alt="" height="1" src="https://github.com/notifications/beacon/ABWnLeqkbRe4GttAQ_2YEk_8WpXtqnKJks5qqkrogaJpZM4J-dnj.gif" width="1" /></p>
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