TgBot++: workflows: Add android app ci

.github/workflows/android_client_test.yml

@@ -0,0 +1,55 @@
+name: Build TgBot++ Client (Android)
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    env:
+      # Customize the Java version needed for your project here
+      JAVA_VERSION: '17'
+
+    steps:
+    - name: Checkout code
+      uses: actions/[email protected]
+
+    - name: Set up JDK ${{ env.JAVA_VERSION }}
+      uses: actions/[email protected]
+      with:
+        distribution: 'zulu'
+        java-version: ${{ env.JAVA_VERSION }}
+
+    - name: Prepare Gradle Cache
+      uses: actions/cache@v2
+      with:
+        path: |
+          ~/.gradle/caches
+          ~/.gradle/wrapper
+        key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
+        restore-keys: |
+          ${{ runner.os }}-gradle-
+
+    - name: Set up Android SDK
+      uses: android-actions/[email protected]
+
+    - name: Grant execute permission for gradlew
+      run: chmod +x clientapp/android/gradlew
+
+    - name: Build with Gradle
+      run: |
+        cd clientapp/android
+        ./gradlew --no-daemon build
+
+    - name: Upload build artifacts
+      uses: actions/upload-artifact@v2
+      with:
+        name: app-build
+        path: |
+          clientapp/android/app/build/outputs/apk/