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

[Andy Allan]

I'm keen to see this finished and merged, but I've run out of time this week for a second review. 

What I should mention is that when I tried it previously it slightly messed up my regular development environment. This is, as far as I can figure out, because when I ran the docker container it wrote some cache files to the `project_repo/tmp` directory *as root* (:nauseated_face:). When I then tried to run rails outside of the container, everything failed since my regular user couldn't update those files. I had to do some `find . -group root | sudo xargs rm` outside of the container to get rid of them.

I'm not sure if it's possible to avoid this, i.e. configure it so that whenever a process within the container writes to the non-containerised filesystem, for it to do so as my user instead of root. But I thought I would mention it in case any Docker experts know how to do this.

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