Initial iOS Hello World app with Gitea Actions build workflow

HelloWorld/HelloWorldApp.swift

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+//  HelloWorldApp.swift
+//  iOS-hello_world
+//
+//  Simple SwiftUI app built via Gitea Actions on the iMac runner.
+
+import SwiftUI
+
+@main
+struct HelloWorldApp: App {
+    var body: some Scene {
+        WindowGroup {
+            ContentView()
+        }
+    }
+}