ogs5py provides a routine to download a pre-compiled OGS5 executable for the desired system:
For now I relied on the provided downloads at: OpenGeoSys-5
and the jenkins site: https://jenkins.opengeosys.org/job/ufz/job/ogs5/job/master/
The jenkins site was used to get nightly builds and different build options but unfortunately this site is down right now.
Is there a plan to provide these again? Since GitHub actions now provides Windows, MacOS and Linux support, one could use this service to build OGS5 on all platforms.