Based on https://github.com/pypa/manylinux.

Adaptations:

• keep python static libraries so we can use them during the build
• install all dependencies to the image for Valhalla (valhalla_python branch) and OSRM (osrm-python branch)
• install protobuf == 21.1 (last before the abseil debacle), but not sure anymore why.. might be a relic from early days..

Don't try to build locally, it's very painful and CI caches properly, so it shouldn't take forever.