GitHub: Update CI

Move android runner to linux
Add iOS build test

Author: brianchang928

.github/workflows/main.yml

@@ -1,22 +1,47 @@
-# SPDX-FileCopyrightText: 2024 OPass
+# SPDX-FileCopyrightText: 2024-2025 OPass
 # SPDX-License-Identifier: GPL-3.0-only
 
 name: CI
-on: [ push, pull_request ]
+on: [push, pull_request]
 
 jobs:
-  build:
+  build-android:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout the code
+        uses: actions/checkout@v4
+
+      - name: Setup JDK 21
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'corretto'
+          java-version: 21
+          cache: 'gradle'
+
+      - name: Build Android
+        run: ./gradlew assembleRelease
+
+  build-ios:
     runs-on: macos-latest
     steps:
-      -   name: Checkout the code
-          uses: actions/checkout@v4
-
-      -   name: Setup JDK 21
-          uses: actions/setup-java@v4
-          with:
-            distribution: 'corretto'
-            java-version: 21
-            cache: 'gradle'
-
-      -   name: Build Android
-          run: ./gradlew assembleRelease
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup JDK 21
+        uses: actions/setup-java@v4
+        with:
+          distribution: corretto
+          java-version: 21
+          cache: gradle
+
+      - name: Select Xcode 16.4
+        run: sudo xcode-select --switch /Applications/Xcode_16.4.app
+
+      - name: Build iOS
+        run: |
+          xcodebuild \
+            -project iosApp/OPass.xcodeproj \
+            -scheme OPass \
+            -configuration Debug \
+            -destination "platform=iOS Simulator,name=iPhone 16 Pro Max,OS=latest" \
+            build