Update to Babylon.js 9.0 and modernize React Native stack

.eslintrc.js

@@ -1,16 +1,4 @@
 module.exports = {
   root: true,
-  extends: '@react-native-community',
-  parser: '@typescript-eslint/parser',
-  plugins: ['@typescript-eslint'],
-  overrides: [
-    {
-      files: ['*.ts', '*.tsx'],
-      rules: {
-        '@typescript-eslint/no-shadow': ['error'],
-        'no-shadow': 'off',
-        'no-undef': 'off',
-      },
-    },
-  ],
+  extends: '@react-native',
 };

.github/workflows/ci.yml

@@ -0,0 +1,62 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  lint-and-typecheck:
+    name: Lint & Typecheck
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: npm
+      - run: npm install --legacy-peer-deps
+      - run: npx tsc --noEmit
+
+  build-android:
+    name: Build Android
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: npm
+      - uses: actions/setup-java@v4
+        with:
+          distribution: zulu
+          java-version: 17
+      - run: npm install --legacy-peer-deps
+      - name: Build Android
+        working-directory: android
+        run: ./gradlew assembleDebug
+
+  build-ios:
+    name: Build iOS
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: npm
+      - run: npm install --legacy-peer-deps
+      - name: Install CocoaPods dependencies
+        working-directory: ios
+        run: pod install --repo-update
+      - name: Build iOS
+        working-directory: ios
+        run: |
+          xcodebuild build \
+            -workspace BabylonReactNativeSample.xcworkspace \
+            -scheme BabylonReactNativeSample \
+            -sdk iphonesimulator \
+            -destination 'platform=iOS Simulator,name=iPhone 16' \
+            -configuration Debug \
+            CODE_SIGNING_ALLOWED=NO | tail -20