TODO(ci): automatically create draft releases on v*.* tag push

[akavel]

• when a v* tag is pushed - on: push: tags: [ 'v*.*' ] (via)
• assert that v... in Cargo.toml matches with the tag; fail build if it doesn't
• create new draft release (hints) - only if it doesn't exist yet (hints)
• build with --release mode for multiple targets: at least windows-amd64, linux-amd64, darwin-mX, darwin-amd64
• upload mana binaries, with target included in name, as release asset binaries