Xcode 13.2, Xcode 13.1 Update on M1! 
Notable changes on Intel:
- Golang upgrade to 1.18
- brew packages
To select these Stacks you just have to open your app on https://www.bitrise.io,
go to the Workflow tab (Workflow Editor), and on the Stack tab select the Xcode 13.2.x or Xcode 13.1.x option and your next build will start on the corresponding stack.
*Note: you can now select separate stacks for separate workflows!
Read more at: https://blog.bitrise.io/per-workflow-stack-selection-is-here
You can find the system reports here:
https://github.com/bitrise-io/bitrise.io/blob/master/system_reports/MACOS/M1/osx-xcode-13.2.x.log
https://github.com/bitrise-io/bitrise.io/blob/master/system_reports/MACOS/M1/osx-xcode-13.1.x.log
If you’d like to add additional tools to be pre-installed you can find the instructions on GitHub, for both the Linux and for the macOS stacks.
_Information about Stack types & update schedules can be found here: discuss.bitrise.io/t/281
Happy Building! 