[HideousKojima]

Biggest issue with MacOS is that it requires a physical Mac (not virtualization) and IIRC the licening from Apple requires a minimum "rental" period of 24 hours or something like that

Edit: the TOS for OS X says this:

3. Leasing for Permitted Developer Services. A. Leasing. You may lease or sublease a validly licensed version of the Apple Software in its entirety to an individual or organization (each, a “Lessee”) provided that all of the following conditions are met: (i) the leased Apple Software must be used for the sole purpose of providing Permitted Developer Services and each Lessee must review and agree to be bound by the terms of this License; (ii) each lease period must be for a minimum period of twenty-four (24) consecutive hours;

[yla92]

What I did for work was, getting a Mac Mini and set up multiple self hosted runners in Tmux (very hackish, I know). The builds became faster (and cheaper) because each run no longer had to download the dependencies again.

Of course, hosting myself means I also gotta own the uptime of it..

[mysteria]

How does Github Actions get away with this? They certainly don't bill and provide the machine for 24 hours for each CI run.