Add Android CI workflow

Author: baich110

.github/workflows/android.yml

@@ -0,0 +1,33 @@
+name: Android CI
+
+on:
+  push:
+    branches: [ main, master ]
+  pull_request:
+    branches: [ main, master ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    
+    steps:
+    - uses: actions/checkout@v4
+    
+    - name: Set up JDK 17
+      uses: actions/setup-java@v4
+      with:
+        java-version: '17'
+        distribution: 'temurin'
+        cache: gradle
+    
+    - name: Grant execute permission for gradlew
+      run: chmod +x gradlew
+    
+    - name: Build debug APK
+      run: ./gradlew assembleDebug --no-daemon
+    
+    - name: Upload APK
+      uses: actions/upload-artifact@v4
+      with:
+        name: app-debug
+        path: app/build/outputs/apk/debug/*.apk