[Tile-serving] [openstreetmap/osm2pgsql] add support for dockerfile build (#1427)

[Stephan]

osmtools/builder is available on docker hub. But I do not recommend to use it. This was just for "inspiration", so you get an idea on how I build it. It is an image I use to build multiple osm tools in a similar fashion than osm2pgsql. A docker built environment for osm2pgsql should stack on top of some maintained base image. Either alpine or debian/ubuntu, like you did.

The second section of the Dockerfile shows how to use files from the earlier stage. I only extract the binary.

I don't think that MinSizeRel will trigger any static linkage, but I have not checked. I also do not run the binary from within the "FROM scratch" container. That one is very empty and just holds the versioned artifact.

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