Add GitHub Actions

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: "gradle"
+    directory: "/"
+    schedule:
+      interval: "daily"

.github/workflows/android.yml

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+name: Android CI
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@main
+    - name: set up JDK 21
+      uses: actions/setup-java@main
+      with:
+        java-version: '21'
+        distribution: 'temurin'
+
+    - name: Build with Gradle
+      run: ./gradlew app:assembleRelease
+
+    - name: Rename signed apk
+      run: mv app/build/outputs/apk/release/app-release-unsigned.apk app/build/outputs/apk/release/Pixelify_GPhotos.apk
+
+    - uses: noriban/sign-android-release@master
+      name: Sign app APK
+      id: sign_app
+      with:
+        releaseDirectory: app/build/outputs/apk/release
+        signingKeyBase64: ${{ secrets.SIGNING_KEY }}
+        alias: ${{ secrets.ALIAS }}
+        keyStorePassword: ${{ secrets.KEY_STORE_PASSWORD }}
+        keyPassword: ${{ secrets.KEY_PASSWORD }}
+
+    - name: Upload signed APK
+      uses: actions/upload-artifact@main
+      with:
+        name: Pixelify_GPhotos.apk
+        path: ${{steps.sign_app.outputs.signedReleaseFile}}
+
+    - name: Collect signed APK
+      uses: actions/download-artifact@main
+      with:
+        name: Pixelify_GPhotos.apk