[openstreetmap/openstreetmap-website] [WIP] Add docker support (#2272)

[Fazle Rabbi]

> You should also configure an unprivileged user for the Docker images.

hi @robbyoconnor. I don't know a lot about unprivileged user in docker but saw `bundle` complaining about it being running as `root` so thanks for the unprivileged user creation pointer. I am still stuck with the basics ie. running the test properly and populating the database. So for now I will add this to do and try to finish it after the basic tasks are done. 

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note to self: This medium [article](https://medium.com/better-programming/running-a-container-with-a-non-root-user-e35830d1f42a) seems to have a good explanation. Might come handy. 

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