Publish .apk & .ipa files in github releases

[emanuelb]

Publish the .ipa file (iOS app) & universal .apk file (Android app) in github releases: (add the .ipa & .apk files as assets)
https://github.com/monya-wallet/monya/releases/

[MissMonacoin]

I'm trying to migrate Circle CI to GitHub Actions and output as artifact but it's running into difficulties.