Auto-sign MacOS build artifact in Action

[rdlewin]

Requires signing up as Apple Developer

One guide on how to add signature to CD: https://localazy.com/blog/how-to-automatically-sign-macos-apps-using-github-actions

┆Issue is synchronized with this Jira Task by Unito

[kavalerov]

Just to confirm - my old account with Apple is inactive, so I suggest we register a new one.