ci: Add Llama demo app build for Android

Author: chmjkb

.github/workflows/build-android-llama-example.yml

@@ -0,0 +1,43 @@
+name: Llama Example app Android build check
+on:
+  pull_request:
+    paths:
+      - .github/workflows/build-android-llama-example.yml
+      - android/**
+      - third-party/android/**
+      - examples/llama/package.json
+      - examples/llama/android/**
+  push:
+    branches:
+      - main
+    paths:
+      - .github/workflows/build-android-llama-example.yml
+      - android/**
+      - third-party/android/**
+      - examples/llama/package.json
+      - examples/llama/android/**
+jobs:
+  build:
+    if: github.repository == 'software-mansion/react-native-executorch'
+    runs-on: ubuntu-latest
+    env:
+      WORKING_DIRECTORY: examples/llama
+    concurrency:
+      group: android-${{ github.ref }}
+      cancel-in-progress: true
+    steps:
+      - name: Check out Git repository
+        uses: actions/checkout@v4
+
+      - name: Setup Java 17
+        uses: actions/setup-java@v3
+        with:
+          distribution: 'zulu'
+          java-version: 17
+
+      - name: Install node dependencies
+        run: yarn install --immutable
+
+      - name: Build app
+        working-directory: ${{ env.WORKING_DIRECTORY }}/android
+        run: ./gradlew assembleDebug --build-cache -PreactNativeArchitectures=arm64-v8a