GitHub right now only has their self-hosted Mac runner released as an Intel Build, but it works fine through Rosetta, though running Apple Silicon Xcode might require some additional wrapping of commands with `arch` which might or might not be built into the pre-built action you're using.
We're currently using an Intel Mac we've used from before we migrated from Jenkins to GitHub actions, so your mileage may vary.
We're currently using an Intel Mac we've used from before we migrated from Jenkins to GitHub actions, so your mileage may vary.