[openstreetmap/openstreetmap-website] Update Docker documentation and Dockerfile (PR #4101)

[Andy Allan]

> `ca-certificates` I think is a worthwhile package to install. Without it a system does not have a default CA root trust store, which likely could lead to certificate errors or undefined behaviour.

In theory, perhaps? But it's not actually necessary, otherwise our CI build would already be failing, right?

In any case, as per my original review, it's unrelated to updating the documentation.

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