Cannot use the release receipt for TestFlight on macOS/tvOS

[keeshux]

macOS: Unfortunately, the sandbox receipt has the same path as the release receipt. The release receipt is therefore overwritten by the sandbox receipt when installing a TestFlight build.

tvOS: Cannot write to App Group. TV beta is particularly useless because unusable do to this.

Branch: backup/feature/retain-release-receipt

[keeshux]

This could work AFTER releasing the new app:

• Only copy the receipt to App Group (doesn't work on tvOS. somewhere shared, keychain?) when in release builds (v2 doesn't save it)
• Also, use the App Group receipt in the app, not just the tunnel