Add Github Action scripts

.github/workflows/android-bulid.yml

@@ -0,0 +1,42 @@
+on:
+  push:
+    branches:
+      - master  # Replace 'main' with your default branch if different.
+  workflow_dispatch:
+
+jobs:
+  build:
+    name: Build Android APK
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+
+    - name: Set up JDK 8
+      uses: actions/setup-java@v2
+      with:
+        java-version: '8'
+        distribution: 'temurin'
+
+    - name: Grant execute permission for gradlew
+      run: chmod +x ./gradlew
+
+    - name: Cache Gradle packages
+      uses: actions/cache@v3
+      with:
+        path: |
+          ~/.gradle/caches
+          ~/.gradle/wrapper
+        key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
+        restore-keys: |
+          ${{ runner.os }}-gradle-
+
+    - name: Build release APK
+      run: ./gradlew assembleRelease
+
+    - name: Upload APK
+      uses: actions/upload-artifact@v4
+      with:
+        name: app-release
+        path: app/build/outputs/apk/release/*.apk