Move Release Build to GitHub Actions

[mheidinger]

Goal is to create an automatic release on tag creation.

Steps would probably be:

• Put required certificates and credentials into secrets
• Set up xcode in GHA: https://docs.github.com/en/actions/use-cases-and-examples/deploying/installing-an-apple-certificate-on-macos-runners-for-xcode-development
• Go through script as currently in archive post build
• Create release with built DMG + auto create release notes