(chore): Add example project build job to CI

.github/actions/build-android/action.yml

@@ -0,0 +1,47 @@
+name: Build Android
+description: >-
+  Build the example app's Android (new arch)
+
+inputs:
+  rn-version:
+    description: 'react-native version to force in the example (e.g. "nightly", "0.84"). Empty = use the committed lockfile.'
+    required: false
+    default: ''
+
+runs:
+  using: composite
+  steps:
+    - name: Setup Node
+      uses: actions/setup-node@v5
+      with:
+        node-version: 24
+        cache: 'npm'
+        cache-dependency-path: example/package-lock.json
+
+    - name: Setup Java
+      uses: actions/setup-java@v5
+      with:
+        distribution: temurin
+        java-version: 17
+        cache: gradle
+
+    - name: Install example dependencies
+      shell: bash
+      run: |
+        npm pkg delete scripts.prepare
+        if [ -n "${{ inputs.rn-version }}" ]; then
+          npm --prefix example pkg set "overrides.react-native=${{ inputs.rn-version }}"
+          npm --prefix example install --no-save
+        else
+          npm --prefix example ci
+        fi
+
+    - name: Prebuild native project (android)
+      shell: bash
+      run: npx expo prebuild --platform android --no-install
+      working-directory: example
+
+    - name: Build Android (assembleDebug, new arch)
+      shell: bash
+      run: ./gradlew assembleDebug -PnewArchEnabled=true -PreactNativeArchitectures=arm64-v8a --no-daemon
+      working-directory: example/android

.github/actions/build-ios/action.yml

@@ -0,0 +1,54 @@
+name: Build iOS
+description: >-
+  Build the example app's iOS (new arch).
+
+inputs:
+  rn-version:
+    description: 'react-native version to force in the example (e.g. "nightly", "0.84"). Empty = use the committed lockfile.'
+    required: false
+    default: ''
+
+runs:
+  using: composite
+  steps:
+    - name: Setup Node
+      uses: actions/setup-node@v5
+      with:
+        node-version: 24
+        cache: 'npm'
+        cache-dependency-path: example/package-lock.json
+
+    - name: Install example dependencies
+      shell: bash
+      run: |
+        npm pkg delete scripts.prepare
+        if [ -n "${{ inputs.rn-version }}" ]; then
+          npm --prefix example pkg set "overrides.react-native=${{ inputs.rn-version }}"
+          npm --prefix example install --no-save
+        else
+          npm --prefix example ci
+        fi
+
+    - name: Prebuild native project (ios)
+      shell: bash
+      run: npx expo prebuild --platform ios --no-install
+      working-directory: example
+
+    - name: Pod install
+      shell: bash
+      run: pod install
+      working-directory: example/ios
+
+    - name: Build iOS (xcodebuild)
+      shell: bash
+      run: |
+        xcodebuild \
+          -workspace example.xcworkspace \
+          -scheme example \
+          -configuration Debug \
+          -sdk iphonesimulator \
+          -destination 'generic/platform=iOS Simulator' \
+          build \
+          CODE_SIGNING_ALLOWED=NO \
+          -quiet
+      working-directory: example/ios

.github/workflows/ci.yml

@@ -2,9 +2,9 @@ name: CI
 
 on:
   push:
-    branches: [ main ]
+    branches: [main]
   pull_request:
-    branches: [ main ]
+    branches: [main]
 
 permissions:
   contents: read
@@ -15,16 +15,16 @@ concurrency:
 
 jobs:
   ci:
-    name: CI
+    name: Code Quality
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Setup Node
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v5
         with:
-          node-version: 20
+          node-version: 24
           cache: 'npm'
 
       - name: Install dependencies
@@ -46,3 +46,23 @@ jobs:
             git status --porcelain
             exit 1
           fi
+
+  android:
+    name: Build Android (new arch)
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v5
+
+      - name: Build Android
+        uses: ./.github/actions/build-android
+
+  ios:
+    name: Build iOS (new arch)
+    runs-on: macos-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v5
+
+      - name: Build iOS
+        uses: ./.github/actions/build-ios

.github/workflows/nightly.yml

@@ -0,0 +1,34 @@
+name: nightly
+
+on:
+  schedule:
+    - cron: '0 6 * * *'
+  workflow_dispatch: {}
+
+permissions:
+  contents: read
+
+jobs:
+  nightly-android:
+    name: Build Android against react-native@nightly
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v5
+
+      - name: Build Android
+        uses: ./.github/actions/build-android
+        with:
+          rn-version: nightly
+
+  nightly-ios:
+    name: Build iOS against react-native@nightly
+    runs-on: macos-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v5
+
+      - name: Build iOS
+        uses: ./.github/actions/build-ios
+        with:
+          rn-version: nightly