[Tile-serving] [openstreetmap/osm2pgsql] Dockerfile for osm2pgsql (#1428)

[hypervtechnics]

As part of the MapDiscover project we are planning to use osm2pgsql to create a POI database. The Lua integration is just perfect for this use case. Thanks for this one! MapDiscover consists of multiple services, each represented as a container image.

So we tried to build a container image using Docker + Dockerfile and the build instructions of the README.md. As mentioned in #1427 the image size is very large (unoptimized ~1,4 GB with debian-slim-buster). I tried to use multi-stage builds and so on, but only could get to 700 MB by manually (using try and error) removing several dependencies (still not sure if everything works):
There are also no official docs which libraries are needed to run the binary release once you built it.

Today we got the first working docker image with several additions:

- Continuous replication support
- LuaJIT support
- Initial parsing of osm input
- Usage of environment variables

I am somehow used to Golang where you built an application and just put it in the container. Of course this doesn't work with C++ - I know. But I think having 700+ MB of dependencies for running an application seems just too much.

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https://github.com/openstreetmap/osm2pgsql/discussions/1428
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