Add beta android build workflow

.github/workflows/build-android.yml

@@ -0,0 +1,73 @@
+name: Build MeloNX Android APK
+
+on:
+  workflow_dispatch:
+
+jobs:
+  build:
+    name: Build APK
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Set Up JDK
+        uses: actions/setup-java@v3
+        with:
+          distribution: 'temurin'
+          java-version: '17'
+
+      - name: Setup Android SDK Tools
+        uses: android-actions/setup-android@v3.2.2      
+
+      - name: Install Ninja and CMake
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y ninja-build cmake
+
+      - name: Cache Gradle dependencies
+        uses: actions/cache@v4
+        with:
+          path: ~/.gradle/caches
+          key: gradle-${{ runner.os }}-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
+          restore-keys: gradle-${{ runner.os }}-
+
+      - name: Cache CMake build
+        uses: actions/cache@v4
+        with:
+          path: src/RyujinxAndroid/app/.cxx
+          key: cmake-${{ runner.os }}-${{ hashFiles('src/RyujinxAndroid/CMakeLists.txt', 'src/RyujinxAndroid/**/*.cpp', 'src/RyujinxAndroid/**/*.h') }}
+          restore-keys: cmake-${{ runner.os }}-
+
+      - name: Grant Execute Permission for Gradlew
+        run: chmod +x src/RyujinxAndroid/gradlew
+
+      - name: Build with Gradle
+        run: src/RyujinxAndroid/gradlew assembleDebug
+        working-directory: src/RyujinxAndroid
+
+      - name: Generate Debug Keystore
+        run: |
+          keytool -genkeypair -v -keystore debug.keystore -alias androiddebugkey \
+            -keyalg RSA -keysize 2048 -validity 10000 \
+            -storepass android -keypass android \
+            -dname "CN=Android Debug,O=Android,C=US"
+
+      - name: Sign APK
+        run: |
+          jarsigner -verbose -sigalg SHA256withRSA -digestalg SHA-256 \
+            -keystore debug.keystore -storepass android \
+            src/RyujinxAndroid/app/build/outputs/apk/debug/app-debug.apk androiddebugkey
+
+      - name: Verify APK Signature
+        run: |
+          apksigner verify --verbose src/RyujinxAndroid/app/build/outputs/apk/debug/app-debug.apk
+
+      - name: Upload Signed APK
+        uses: actions/upload-artifact@v4
+        with:
+          name: RyujinxAndroid-APK
+          path: src/RyujinxAndroid/app/build/outputs/apk/debug/app-debug.apk