feat: add GitHub Actions workflow for Android builds

This commit introduces a new GitHub Actions workflow named "AndroidBuild".

The workflow is triggered on pull requests and pushes to the `main` branch.

It performs the following steps:
- Checks out the repository
- Sets up Java JDK version 21
- Builds the Android project using Gradle
- Uploads the generated `app-debug.apk` as a build artifact named "SuperApp.apk"

Author: thecodophile

.github/workflows/AndroidBuild.yml

@@ -0,0 +1,29 @@
+name: AndroidBuild
+on:
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - main
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4.2.2
+
+      - name: Setup Java JDK
+        uses: actions/setup-java@v3.14.1
+        with:
+          distribution: 'adopt'
+          java-version: '21'
+
+      - name: Build with Gradle
+        run: ./gradlew build
+
+      - name: Upload a Build Artifact
+        uses: actions/upload-artifact@v4.6.2
+        with:
+          name: "SuperApp.apk"
+          path: app/build/outputs/apk/app-debug.apk