[openstreetmap/openstreetmap-website] Update Dockerfile to include image manipulation binaries. (PR #4254)

[Andy Allan]

> Aren't system test using precompiled assets, and when you precompile you get all these warnings?

I've just tested this locally, and no, I don't get all these warnings when running system tests. I also checked that optipng is not installed, and the warning is shown when I edit `config/image_optim/test.yml`

I've also checked CI, [which precompiles the assets during testing](https://github.com/openstreetmap/openstreetmap-website/blob/926229e286520ed23fb5e8add94c6048aa592412/.github/workflows/tests.yml#L58-L59) and again there's no warnings from image_optim - which is to be expected, since we disable them for the test environment, and any precompilation will also happen in the same environment.

@AntonKhorev If you are seeing the warnings in either the development or test environments, please open an issue so that we can investigate further.


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