FirebaseのSwift PM対応は、IPA生成時にエラーを踏むのでプロダクションではしばらく使ってはいけないになってしまった https://github.com/firebase/firebase-ios-sdk/issues/6726

Adding Firebase SPM creates IPA processing error when exporting an ...

Step 0: Are you in the right place? For issues or feature requests related to the code in this repository file a Github issue. If this is a feature request please use the Feature Request template. ...