action: add Android build test

.github/actions/check-rebuild/action.yml

@@ -0,0 +1,20 @@
+name: Check if rebuild required
+description:
+
+inputs:
+  mode:
+    description: build mode to be checked
+    required: false
+    default: build
+
+runs:
+  using: composite
+  steps:
+    - run: |
+        tmpfile=$(mktemp)
+        git show --pretty="format:" --name-only --diff-filter=AMRC ${{ github.event.pull_request.head.sha}} -${{ github.event.pull_request.commits }} | sort | uniq | awk NF > ${tmpfile}
+        echo "changed_file_list=${tmpfile}" >> "$GITHUB_ENV"
+        rebuild=`bash .github/actions/check-rebuild/check_if_rebuild_requires.sh ${tmpfile} ${{ inputs.mode }} | grep "REBUILD=YES" | wc -l`
+        echo "Rebuild required: ${rebuild}"
+        echo "rebuild=${rebuild}" >> "$GITHUB_ENV"
+      shell: sh

.github/actions/check-rebuild/check_if_rebuild_requires.sh

@@ -0,0 +1,83 @@
+#!/usr/bin/env bash
+
+##
+# Copyright (c) 2018 Samsung Electronics Co., Ltd. All Rights Reserved.
+#
+# @file: check_if_rebuild_requires.sh
+# @brief    Check if rebuild & unit-test is required with the given PR.
+# @see      https://github.com/nnstreamer/nnstreamer
+# @author   MyungJoo Ham <[email protected]>
+#
+# Argument 1 ($1): the file containing list of files to be checked.
+# Argument 2 ($2): build mode to be checked
+#                  gbs: check if Tizen GBS build is required
+#                  debian: check if pdebuild is required
+#                  android: check if jni rebuild is required
+#                  build (default): check if general meson rebuild is required.
+
+if [ -z $1 ]; then
+  echo "::error The argument (file path) is not given."
+  exit 1
+fi
+
+if [ -z $2 ]; then
+  mode="build"
+else
+  mode=$2
+fi
+
+rebuild=0
+regbs=0
+redebian=0
+reandroid=0
+
+for file in `cat $1`; do
+  case $file in
+    *.md|*.png|*.webp|*.css|*.html )
+    ;;
+    packaging/* )
+      regbs='1'
+      ;;
+    debian/* )
+      redebian='1'
+      ;;
+    jni/* )
+      reandroid='1'
+      ;;
+    * )
+      rebuild='1'
+      regbs='1'
+      redebian='1'
+      reandroid='1'
+      ;;
+  esac
+done
+
+case $mode in
+  gbs)
+    if [[ "$regbs" == "1" ]]; then
+      echo "REBUILD=YES"
+      exit 0
+    fi
+    ;;
+  debian)
+    if [[ "$redebian" == "1" ]]; then
+      echo "REBUILD=YES"
+      exit 0
+    fi
+    ;;
+  android)
+    if [[ "$reandroid" == "1" ]]; then
+      echo "REBUILD=YES"
+      exit 0
+    fi
+    ;;
+  *)
+    if [[ "$rebuild" == "1" ]]; then
+      echo "REBUILD=YES"
+      exit 0
+    fi
+    ;;
+esac
+
+echo "REBUILD=NO"

.github/workflows/android.yml

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+name: Build test/ Android NDK
+
+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: r26d
+        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 meson ninja-build libflatbuffers-dev flatbuffers-compiler protobuf-compiler
+        echo "::endgroup::"
+    - name: NDK Build
+      if: env.rebuild == '1'
+      run: |
+        echo "::group::Run package_android.sh"
+        ./tools/package_android.sh
+        echo "::endgroup::"
+        echo "::group::Meson build"
+        meson build -Dplatform=android
+        ninja -C build
+        echo "::endgroup::"
+        echo "::group::NDK build"
+        pushd build/jni
+        ndk-build NDK_PROJECT_PATH=./ APP_BUILD_SCRIPT=./Android.mk NDK_APPLICATION_MK=./Application.mk
+        popd
+        echo "::endgroup::"
+    - name: Install built binaries for application build
+      if: env.rebuild == '1'
+      run: |
+        echo "Installing build bianries for application build"
+        mkdir -p libs/arm64-v8a
+        cp -R build/jni/libs/arm64-v8a/* libs/arm64-v8a
+    - name: Android NNTrainer Application Build
+      if: env.rebuild == '1'
+      run: |
+        echo "::group::LogisticRegression"
+        pushd Applications/LogisticRegression/jni
+        ndk-build NDK_PROJECT_PATH=./ APP_BUILD_SCRIPT=./Android.mk NDK_APPLICATION_MK=./Application.mk
+        popd
+        echo "::endgroup::"