MetaMask .dmg for iOS simulators

### **Description**

If MM would upload a .dmg for iOS 12 instead of forcing users to try to deploy the React Native based Git project on their own that would be fantastic.

I personally spent 30 hours to try to deploy the MM project to iOS simulator (I have experience in React Native, have environment set up, I deploy other projects regularly) just that I be able to trigger the MetaMask app if I develop a DAPP for iOS. Ton of errors, refuses to work.

In Android this issue does not appears, as I'm able to log in to the Play Store in Android simulators, and easily install the MM app from there.

### **Technical Details**

- MM .dmg would be available from MM official website to download for developers
- In every major release, MM team creates a .dmg and uploads

### **Acceptance Criteria**

- dmg file works in baseline (12) iOS and upper
- Obviously, if the solution requires a higher iOS, MM team maintains the right to raise sw required os level

Review the iOS simulator build workflow and the release process for publishing developer downloads from the official website. Done means a .dmg is produced for each major release, works on iOS 12 and later simulators, and the required operating-system level is documented if it changes.

Written by the indexing model from the issue text.