Set up Android CI

.github/workflows/android.yml

@@ -0,0 +1,38 @@
+name: Android CI
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Check out
+      uses: actions/checkout@v4
+      with:
+        submodules: "recursive"
+        fetch-depth: 0
+
+    - name: set up JDK 17
+      uses: actions/setup-java@v3
+      with:
+        distribution: 'temurin'
+        java-version: '17'
+        cache: gradle
+
+    - name: Grant execute permission for gradlew
+      run: chmod +x gradlew
+      
+    - name: Build with Gradle
+      run: ./gradlew assembleRelease
+      
+    - name: Create PlayIntegrityFix zip
+      uses: actions/upload-artifact@v3
+      with:
+        name: PlayIntegrityFix
+        path: out/PlayIntegrityFix.zip

.gitmodules

@@ -1,3 +1,3 @@
-[submodule "app/src/main/cpp/libcxx"]
+[submodule "libcxx"]
 	path = app/src/main/cpp/libcxx
 	url = https://github.com/topjohnwu/libcxx.git