<blockquote>
<p>If there's some way to disable them in the example config (I assume they're not actually used in the tests), would that be better?</p>
</blockquote>
<p><a href="https://github.com/openstreetmap/openstreetmap-website/blob/master/config/image_optim/test.yml">The warnings should already be excluded when running the tests</a>. Did you see the warnings during development?</p>

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