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Why not move to GitLab right now? Their core product is OSS and the CI is integrated and free for OSS projects.

I don't really see how it's any better. But I am using and loving gitlab ci for my projects on paid plans fwiw.

It's better because you could move to self-hosting if something happens to gitlab.com.

Also other CI systems support their configuration format: https://blog.drone.io/drone-adapter-gitlab-pipelines/

No free Windows and macOS runners.

It's easy enough to add your own. I use the cloud-based runners for Linux, then provide my own for Windows, Mac and FreeBSD, all VMs.

Maybe it's easy to add them, but I don't have any Windows or macOS servers in the first place.