zlib-rs provides the same performance as zlib-ng with minedmap, while
reducing the amount of C code and avoiding the external build dependency
on CMake.
Including tini fixes forwarding signals to MinedMap, allowing to
interrupt it using Ctrl-C. The base tools may be used to add a wrapper
script to configure MinedMap with environment variables.
As the Alpine base is included now, we can switch from the rust:alpine
image to alpine:latest, resulting in MinedMap to be linked dynamically.