Simplify OpenHarmony build to target only ARM64

Removed the build matrix and related logic for multiple ABIs in the OpenHarmony build job. The workflow now only builds for the ARM64 architecture, streamlining the configuration and build steps.

Author: lijy91

.github/workflows/build.yml

@@ -151,14 +151,8 @@ jobs:
 
   # OpenHarmony builds
   build-ohos:
-    strategy:
-      matrix:
-        abi:
-          - arm64-v8a
-          - armeabi-v7a
-
     runs-on: ubuntu-latest
-    name: Build OpenHarmony (${{ matrix.abi }})
+    name: Build OpenHarmony
 
     steps:
       - uses: actions/checkout@v4
@@ -197,38 +191,33 @@ jobs:
       - name: Configure CMake for OpenHarmony
         shell: bash
         run: |
-          # Map CMake ABIs to OpenHarmony architectures
-          case "${{ matrix.abi }}" in
-            arm64-v8a)
-              OHOS_ARCH=arm64
-              CMAKE_ANDROID_ARCH_ABI=arm64-v8a
-              ;;
-            armeabi-v7a)
-              OHOS_ARCH=arm
-              CMAKE_ANDROID_ARCH_ABI=armeabi-v7a
-              ;;
-            *)
-              echo "Unsupported ABI: ${{ matrix.abi }}"
-              exit 1
-              ;;
-          esac
-
-          mkdir build-ohos-${{ matrix.abi }}
-          cd build-ohos-${{ matrix.abi }}
-
-          # Configure CMake with OpenHarmony toolchain
+          mkdir build-ohos
+          cd build-ohos
+
+          # Find ninja executable
+          NINJA=$(which ninja)
+          echo "Found ninja at: $NINJA"
+
+          # Debug: Check SDK structure
+          echo "SDK structure:"
+          ls -la $OHOS_SDK_PATH/native/ || true
+          echo "Toolchain file:"
+          cat $OHOS_SDK_PATH/native/build/cmake/ohos.toolchain.cmake | head -150 || true
+
+          # Configure CMake with OpenHarmony toolchain (ARM64 only)
           cmake .. \
             -DCMAKE_SYSTEM_NAME=OHOS \
             -DCMAKE_TOOLCHAIN_FILE=$OHOS_SDK_PATH/native/build/cmake/ohos.toolchain.cmake \
-            -DOHOS_ARCH=$OHOS_ARCH \
-            -DCMAKE_ANDROID_ARCH_ABI=$CMAKE_ANDROID_ARCH_ABI \
+            -DOHOS_ARCH=aarch64 \
+            -DCMAKE_ANDROID_ARCH_ABI=arm64-v8a \
             -DCMAKE_BUILD_TYPE=Release \
+            -DCMAKE_MAKE_PROGRAM=$NINJA \
             -G Ninja
 
       - name: Build Examples
         shell: bash
         run: |
-          cd build-ohos-${{ matrix.abi }}
+          cd build-ohos
           cmake --build . --config Release
 
   # Windows build