actions: create ci workflow

Create a github actions workflow that automatically produces artifacts.

.github/workflows/android.yml

@@ -0,0 +1,38 @@
+name: Android CI
+
+on:
+  push:
+    branches: [ "dev" ]
+  pull_request:
+    branches: [ "dev" ]
+    
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    
+    steps:
+    - uses: actions/checkout@v3
+    - name: set up JDK 11
+      uses: actions/setup-java@v3
+      with:
+        java-version: '11'
+        distribution: 'temurin'
+        cache: gradle
+    - name: Run pre-build steps
+      uses: nttld/setup-ndk@v1.2.0
+      id: setup-ndk
+      with:
+        ndk-version: r21e
+        add-to-path: false
+    - run: python3 prebuild.py
+      env:
+        ANDROID_NDK_HOME: ${{ steps.setup-ndk.outputs.ndk-path }}
+    - name: Grant execute permission for gradlew
+      run: chmod +x gradlew
+    - name: Build Debug APK with Gradle
+      run: ./gradlew buildDebug
+    - name: Upload a Build Artifact
+      uses: actions/upload-artifact@v3.1.1
+      with:
+        name: Auxio_Canary.apk
+        path: ./app/build/intermediates/apk/debug/app-debug.apk