Mac builds were 15% of my minutes and 57% of my bill.
git clone https://github.com/Kloudy-Sky/runnerbox cd runnerbox && pnpm install pnpm runnerbox report --repo you/your-app
Any pull request could run code on your machine, and standard GitHub runners are free there anyway. If you have to, read the threat model first.
runnerbox report works today. The launcher hasn't run a real job, so don't point CI at it. Read how I got here.