M1ではCarthageも使えない状況 https://github.com/firebase/firebase-ios-sdk/issues/7039

Carthage doesn't download Firebase binaries on Apple M1 · Issue #70...

[REQUIRED] Step 1: Describe your environment Xcode version: 12.2 Firebase SDK version: 7.1.0 Installation method: Carthage Firebase Component: All macOS version: 11.0 Chip: Apple M1 [REQUIRED] Step...