In a recent CirrusCI annoucment they are limited free usage to 40 compute credits. For reference, we used:

• 214 credits in 05/2023
• 355 credits in 06/2023 (Release month, so there was more wheel building)
• 178 credits in 07/2023

Note that Apple Silicon CPU time is 8 times more expensive than Linux for the same CPU time: reference.

I think we'll likely need to stop running ARM CI on PRs and upload ARM wheels once a week.