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

[Eric Theise]

On a practical level, installing them into the Docker image dispenses with the irritation of one's display filling with warnings at multiple stages of `docker compose up` or when a Rails console is needed.

On a "keeping parity" level, they're presented as equally important with `libxml2` and `yarn` in the [MacOSX](https://github.com/openstreetmap/openstreetmap-website/blob/master/INSTALL.md#macosx) section of the Installation instructions.


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