How is build2 as project planning to maintain packages repository for multiple target operation systems? So far all options for Windows I tested looks failed si

How is build2 as project planning to maintain packages repository for multiple target operation systems? So far all options for Windows I tested looks failed since they didn't get enough traction for 3rd party contributors to maintain packages and library developers have absolutely no interest. Is using C++ for everything include web interface is sane solution? I could guess reasons for having build bot and web UI in C++, but not sure if it's good way to get more contributors.