[openstreetmap/openstreetmap-website] Add Docker Compose Support for Development Environment (#2409)

[mmd]

`bundle install` also needs to deploy a few gems in a fresh install, so I would assume this is relevant here as well. 

In a quick test drive, I created a non-root user with uid 1000 right before:

```
# Setup app location
RUN mkdir -p /app
```

(uid 1000 matches my Ubuntu user id)

Then I  changed the ownership of that /app directory to the new user using chown, followed by `USER xyz`.
`bundle install` and `yarn install` would then run as non-root, and that seemed to work ok.

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