chore(CI): GitHub actions integration

.github/workflows/ci.yml

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+name: Android CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ 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 with Gradle
+      run: ./gradlew assembleDebug
+
+    - name: Run unit tests
+      run: ./gradlew testDebugUnitTest
+
+  instrumented-tests:
+    runs-on: ubuntu-latest
+    timeout-minutes: 20
+    strategy:
+      matrix:
+        api-level: [36]
+    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: Run instrumented tests
+      uses: reactivecircus/android-emulator-runner@v2
+      with:
+        api-level: ${{ matrix.api-level }}
+        script: ./gradlew connectedDebugAndroidTest

.github/workflows/release.yml

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+name: Android Release
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+permissions:
+  contents: write
+
+jobs:
+  release:
+    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: Decode Keystore
+      env:
+        ENCODED_KEYSTORE: ${{ secrets.ENCODEDKEYSTORE }}
+      run: |
+        echo $ENCODED_KEYSTORE | base64 -d > release.keystore
+
+    - name: Build Release APK
+      env:
+        KEYSTORE_FILE: ../release.keystore
+        KEYSTORE_PASSWORD: ${{ secrets.KEYSTOREPASSWORD }}
+        KEY_PASSWORD: ${{ secrets.KEYPASSWORD }}
+      run: ./gradlew assembleRelease
+
+    - name: Create Release and Upload APK
+      uses: softprops/action-gh-release@v2
+      with:
+        files: app/build/outputs/apk/release/app-release.apk
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}