action: add Android build test

Android is the major release target of nntrainer.
Build and run test cases for Android.

Signed-off-by: MyungJoo Ham <[email protected]>

.github/workflows/android.yml

@@ -0,0 +1,78 @@
+name: Build test/ Android NDK r12b
+
+on:
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build:
+    runs-on: ubuntu-22.04
+    name: Android NDK build on Ubuntu for arm64-v8a
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        ref: ${{ github.event.pull_request.head.sha }}
+        fetch-depth: -${{ github.event.pull_request.commits }}
+    - name: Check if rebuild required
+      uses: ./.github/actions/check-rebuild
+      with:
+        mode: android
+    - if: env.rebuild == '1'
+      uses: nttld/setup-ndk@v1
+      with:
+        ndk-version: r12b
+        link-to-sdk: true
+    ## @todo Make cache works (daily update cache on main branch / restore the cache on each PR (w/o saving))
+    - name: Prepare Build
+      if: env.rebuild == '1'
+      run: |
+        echo "::group::Install required packages"
+        sudo apt-get update
+        sudo apt-get install tar wget gzip libglib2.0-dev libjson-glib-dev libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev libunwind-dev googletest liborc-0.4-dev flex bison libopencv-dev pkg-config python3-dev python3-numpy python3
+        echo "::endgroup::"
+        if [[ -d ~/android/gst_root_android/arm64 ]] && [[ -f ~/android/gst_root_android/arm64/lib/libgstreamer-1.0.so ]]; then
+          echo "Gst-Root-Android cached."
+        else
+          echo "::group::Download prebuilt Android-Gstreamer libraries"
+          mkdir -p ~/android/gst_root_android/arm64
+          pushd ~/android/gst_root_android/arm64
+          wget http://ci.nnstreamer.ai/warehouse/gstreamer-prebuilts-for-android-device/gst_root_android-custom-1.12.4-ndkr12b-20190213-0900/gstreamer-1.0-android-arm64-1.12.4-runtime.tar.bz2
+          wget http://ci.nnstreamer.ai/warehouse/gstreamer-prebuilts-for-android-device/gst_root_android-custom-1.12.4-ndkr12b-20190213-0900/gstreamer-1.0-android-arm64-1.12.4.tar.bz2
+          tar -xf gstreamer-1.0-android-arm64-1.12.4-runtime.tar.bz2
+          tar -xf gstreamer-1.0-android-arm64-1.12.4.tar.bz2
+          popd
+          echo "::endgroup::"
+        fi
+    - name: NDK Build
+      if: env.rebuild == '1'
+      run: |
+        export GSTREAMER_ROOT_ANDROID=~/android/gst_root_android
+        export TARGET_ARCH_ABI=arm64-v8a
+        export ANDROID_ABI=arm64-v8a
+        export APP_ALLOW_MISSING_DEPS=true
+        export NNSTREAMER_ROOT=$(pwd)
+        target_host=aarch64-linux-android
+        export AR=$target_host-ar
+        export AS=$target_host-clang
+        export CC=$target_host-clang
+        export CXX=$target_host-clang++
+        export LD=$target_host-ld
+        export STRIP=$target_host-strip
+        export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:~/android/gst_root_android/arm64/lib/
+        cd jni
+        echo "::group::Run package_android.sh"
+        tools/package_android.sh
+        echo "::endgroup::"
+        echo "::group::Build NNStreamer with ndk-build"
+        ndk-build NDK_PROJECT_PATH=. APP_BUILD_SCRIPT=./Android.mk NDK_APPLICATION_MK=./Application.mk -j$(nproc)
+        echo "::endgroup::"
+
+        # Workaround for the gstreamer-android prebuild binary build glitches
+        result=$(readelf -d ~/android/gst_root_android/arm64/lib/libfontconfig.so | grep "/data/nnstreamer/cerbero.custom-1.12.4-ndkr12b-20190213-0900/build/dist/android_arm64/lib")
+        if [[ ! -z $result ]]; then
+          echo "Warning: the given prebuilt binaries for Android have incorrect rpaths."
+          sudo mkdir -p /data/nnstreamer/cerbero.custom-1.12.4-ndkr12b-20190213-0900/build/dist/android_arm64/
+          sudo ln -s ~/android/gst_root_android/arm64/lib /data/nnstreamer/cerbero.custom-1.12.4-ndkr12b-20190213-0900/build/dist/android_arm64/lib
+        fi
+
+        cd ..