add GA for android

.github/workflows/android_build.yml

@@ -0,0 +1,73 @@
+name: Android Build
+
+on:
+  push:
+    branches: [ main, develop ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  android-build:
+    runs-on: ubuntu-latest
+    
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+      with:
+        submodules: recursive
+    
+    - name: Set up JDK 17
+      uses: actions/setup-java@v4
+      with:
+        java-version: '17'
+        distribution: 'temurin'
+    
+    - name: Setup Android SDK
+      uses: android-actions/setup-android@v3
+    
+    - name: Install NDK
+      run: |
+        sdkmanager "ndk;25.1.8937393"
+        echo "ANDROID_NDK_ROOT=$ANDROID_SDK_ROOT/ndk/25.1.8937393" >> $GITHUB_ENV
+    
+    - name: Cache Gradle packages
+      uses: actions/cache@v4
+      with:
+        path: |
+          ~/.gradle/caches
+          ~/.gradle/wrapper
+        key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
+        restore-keys: |
+          ${{ runner.os }}-gradle-
+    
+    - name: Make gradlew executable
+      run: chmod +x android/gradlew
+      
+    - name: Build Debug APK
+      run: |
+        cd android
+        ./gradlew assembleDebug
+    
+    - name: Build Release APK
+      run: |
+        cd android
+        ./gradlew assembleRelease
+    
+    - name: Upload Debug APK
+      uses: actions/upload-artifact@v4
+      with:
+        name: torch-converter-debug
+        path: android/app/build/outputs/apk/debug/app-debug.apk
+        retention-days: 30
+    
+    - name: Upload Release APK
+      uses: actions/upload-artifact@v4
+      with:
+        name: torch-converter-release
+        path: android/app/build/outputs/apk/release/app-release.apk
+        retention-days: 30
+    
+    - name: APK Info
+      run: |
+        echo "Debug APK size: $(du -h android/app/build/outputs/apk/debug/app-debug.apk | cut -f1)"
+        echo "Release APK size: $(du -h android/app/build/outputs/apk/release/app-release.apk | cut -f1)"