[openstreetmap/openstreetmap-website] Enable the app to be built using Docker (#1290)

[Tom Hughes]

So the first time I ran it the docker-compose bombed out building the web site image due to a random HTTP failure talking to the debian repos and now I can't start it because every attempt bombs out with:

```
Starting rails_db_1

ERROR: for db  failed to create endpoint rails_db_1 on network rails_default: Error starting userland proxy: listen tcp 0.0.0.0:5432: bind: address already in use
```

Presumably because the database image from the first attempt is still running, but I can't work out how to stop it - a `docker-compose stop` doesn't seem to help.

I can't help feeling it all seems very fragile...

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