[openstreetmap/openstreetmap-website] Prefer COPY to ADD in Dockerfile (PR #5897)

[rkoeze]

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### Description
Updates the Dockerfile to use `COPY` instead of `ADD`. From [Docker's best practices doc](https://docs.docker.com/build/building/best-practices/#add-or-copy):

> You'll mostly want to use COPY for copying files from one stage to another in a multi-stage build.

and:

> The ADD instruction is best for when you need to download a remote artifact as part of your build.

Since we're just copying files, let's prefer `COPY`.

### How has this been tested?
I rebuilt my docker container with these new changes and was able to successfully navigate the app locally.

You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/5897

-- Commit Summary --

  * Prefer COPY to ADD

-- File Changes --

    M Dockerfile (6)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/5897.patch
https://github.com/openstreetmap/openstreetmap-website/pull/5897.diff

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