Add llama demo app to CI (#2763)

Summary: Pull Request resolved: #2763

Test Plan:
CI
https://github.com/pytorch/executorch/actions/runs/8484915346/job/23248744019?pr=2763

Reviewed By: shoumikhin

Differential Revision: D55534899

Pulled By: kirklandsign

fbshipit-source-id: 1756ef8edfa613f4c024566e06d8099c59f0d544

Author: kirklandsign

build/test_android_ci.sh

@@ -20,6 +20,8 @@ build_executorch() {
   rm -rf cmake-out && mkdir cmake-out
   ANDROID_NDK=/opt/ndk BUCK2=$(which buck2) FLATC=$(which flatc) ANDROID_ABI=arm64-v8a \
     bash examples/demo-apps/android/ExecuTorchDemo/setup.sh
+  ANDROID_NDK=/opt/ndk BUCK2=$(which buck2) FLATC=$(which flatc) ANDROID_ABI=arm64-v8a \
+    bash examples/demo-apps/android/LlamaDemo/setup.sh
 }
 
 build_android_demo_app() {
@@ -28,5 +30,12 @@ build_android_demo_app() {
   popd
 }
 
+build_android_llama_demo_app() {
+  pushd examples/demo-apps/android/LlamaDemo
+  ANDROID_HOME=/opt/android/sdk ./gradlew build
+  popd
+}
+
 build_executorch
 build_android_demo_app
+build_android_llama_demo_app

examples/demo-apps/android/LlamaDemo/setup.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 # Copyright (c) Meta Platforms, Inc. and affiliates.
 # All rights reserved.
 #
@@ -28,7 +28,7 @@ else
 fi
 cmake --build "${CMAKE_OUT}" -j "${CMAKE_JOBS}" --target install
 
-cmake examples/models/llama2 -DBUCK2="$BUCK" \
+cmake examples/models/llama2 -DBUCK2="${BUCK2}" \
          -DCMAKE_TOOLCHAIN_FILE=$ANDROID_NDK/build/cmake/android.toolchain.cmake \
          -DANDROID_ABI="$ANDROID_ABI" \
          -DCMAKE_INSTALL_PREFIX="${CMAKE_OUT}" \
@@ -48,7 +48,3 @@ cmake --build "${CMAKE_OUT}"/extension/android -j "${CMAKE_JOBS}"
 JNI_LIBS_PATH="examples/demo-apps/android/LlamaDemo/app/src/main/jniLibs"
 mkdir -p "${JNI_LIBS_PATH}/${ANDROID_ABI}"
 cp "${CMAKE_OUT}"/extension/android/libexecutorch_llama_jni.so "${JNI_LIBS_PATH}/${ANDROID_ABI}/"
-
-pushd extension/android
-./gradlew build
-popd