<p>After looking at the <code>image_optim</code> source I added <a class="commit-link" href="https://github.com/openstreetmap/openstreetmap-website/commit/f9df59a8a49d2aed057eaee0b7249eea329d34c5"><tt>f9df59a</tt></a> to simplify things - when there is a base config it reads that and then merges the environment specific configuration so only the things that need to be changed need to be included.</p>

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