Refactor OpenHarmony SDK download and extraction steps

Simplifies and restructures the OpenHarmony Native SDK download and extraction process in the CI workflow. The new approach extracts only the required zip files, unpacks them into a dedicated directory, and updates environment variable setup and CMake configuration paths accordingly.

Author: lijy91

.github/workflows/build.yml

@@ -170,31 +170,29 @@ jobs:
 
       - name: Download OpenHarmony Native SDK
         run: |
-          # Download OpenHarmony 5.1.0 SDK from mirror
-          # Note: This is a split archive (.aa, .ab, .ac files)
-          wget -q https://github.com/openharmony-rs/ohos-sdk/releases/download/v5.1.0/ohos-sdk-windows_linux-public.tar.gz.aa -O ohos-sdk.tar.gz.aa
-          wget -q https://github.com/openharmony-rs/ohos-sdk/releases/download/v5.1.0/ohos-sdk-windows_linux-public.tar.gz.ab -O ohos-sdk.tar.gz.ab
-          
-          # Combine split archives
-          cat ohos-sdk.tar.gz.* > ohos-sdk.tar.gz
-          
-          # Extract the SDK
-          tar -xzf ohos-sdk.tar.gz
-          
-          # The SDK should be extracted to current directory
-          ls -la
-          
-          # Set up OHOS_NDK_HOME environment variable
-          # SDK structure: ohos-sdk/windows_linux/native/...
-          export OHOS_NDK_HOME=$(pwd)/ohos-sdk/windows_linux/native
-          echo "OHOS_NDK_HOME=$OHOS_NDK_HOME" >> $GITHUB_ENV
-          echo "OHOS_SDK_PATH=$OHOS_NDK_HOME" >> $GITHUB_ENV
-          
-          # Verify SDK structure
-          echo "Checking SDK structure..."
-          ls -la $OHOS_NDK_HOME/ || true
-          ls -la $OHOS_NDK_HOME/build/ || true
-          ls -la $OHOS_NDK_HOME/build/cmake/ || true
+          echo $PWD
+          wget -q \
+            https://github.com/openharmony-rs/ohos-sdk/releases/download/v5.1.0/ohos-sdk-windows_linux-public.tar.gz.aa
+          wget -q \
+            https://github.com/openharmony-rs/ohos-sdk/releases/download/v5.1.0/ohos-sdk-windows_linux-public.tar.gz.ab
+          cat ohos-sdk-windows_linux-public.tar.gz.aa ohos-sdk-windows_linux-public.tar.gz.ab > sdk.tar.gz
+          echo "Extracting native..."
+          mkdir sdk
+          tar -xzf sdk.tar.gz ohos-sdk/linux/native-linux-x64-5.1.0.107-Release.zip
+          tar -xzf sdk.tar.gz ohos-sdk/linux/toolchains-linux-x64-5.1.0.107-Release.zip
+          unzip -qq ohos-sdk/linux/native-linux-x64-5.1.0.107-Release.zip -d sdk
+          unzip -qq ohos-sdk/linux/toolchains-linux-x64-5.1.0.107-Release.zip -d sdk
+          ls -la sdk/native/llvm/bin/
+          rm -rf ohos-sdk-windows_linux-public.tar.gz.aa ohos-sdk-windows_linux-public.tar.gz.ab ohos-sdk/ sdk.tar.gz
+
+      - name: Setup build environment
+        run: |
+          SDK_DIR=$(pwd)/sdk
+          echo "OHOS_NDK_HOME=$SDK_DIR" >> $GITHUB_ENV
+          echo "OHOS_SDK_PATH=$SDK_DIR" >> $GITHUB_ENV
+          ls -la $SDK_DIR/native/ || true
+          ls -la $SDK_DIR/native/build/ || true
+          ls -la $SDK_DIR/native/build/cmake/ || true
 
       - name: Configure CMake for OpenHarmony
         shell: bash
@@ -214,14 +212,14 @@ jobs:
               exit 1
               ;;
           esac
-          
+
           mkdir build-ohos-${{ matrix.abi }}
           cd build-ohos-${{ matrix.abi }}
-          
+
           # Configure CMake with OpenHarmony toolchain
           cmake .. \
             -DCMAKE_SYSTEM_NAME=OHOS \
-            -DCMAKE_TOOLCHAIN_FILE=$OHOS_SDK_PATH/build/cmake/ohos.toolchain.cmake \
+            -DCMAKE_TOOLCHAIN_FILE=$OHOS_SDK_PATH/native/build/cmake/ohos.toolchain.cmake \
             -DOHOS_ARCH=$OHOS_ARCH \
             -DCMAKE_ANDROID_ARCH_ABI=$CMAKE_ANDROID_ARCH_ABI \
             -DCMAKE_BUILD_TYPE=Release \