ci: use python 3.12 for RISC-V64

Signed-off-by: ihb2032 <hebome@foxmail.com>

Author: ihb2032

.github/workflows/03-macos-linux-build.yml

@@ -21,7 +21,6 @@ permissions:
   contents: read
 
 jobs:
-  # Build and test matrix (parallel execution)
   build-and-test:
     name: Build & Test (${{ inputs.platform }})
     runs-on: ${{ inputs.os }}
@@ -32,7 +31,7 @@ jobs:
         include:
           - os: ${{ inputs.os }}
             platform: ${{ inputs.platform }}
-            arch_flag: ""  # Use appropriate architecture
+            arch_flag: ""
 
     steps:
       - name: Checkout code
@@ -41,12 +40,27 @@ jobs:
           submodules: recursive
 
       - name: Set up Python
+        if: ${{ !contains(inputs.os, 'riscv') }}
         uses: actions/setup-python@v6
         with:
           python-version: '3.10'
           cache: 'pip'
           cache-dependency-path: 'pyproject.toml'
 
+      - name: Select Python on RISC-V
+        if: ${{ contains(inputs.os, 'riscv') }}
+        run: |
+          python3.10 --version
+          echo "PYTHON=python3.10" >> $GITHUB_ENV
+        shell: bash
+
+      - name: Select Python on non-RISC-V
+        if: ${{ !contains(inputs.os, 'riscv') }}
+        run: |
+          python --version
+          echo "PYTHON=python" >> $GITHUB_ENV
+        shell: bash
+
       - name: Install Clang
         if: inputs.compiler == 'clang' && runner.os == 'Linux'
         run: |
@@ -61,7 +75,6 @@ jobs:
 
       - name: Set up environment variables
         run: |
-          # Set number of processors for parallel builds
           if [[ "${{ matrix.platform }}" == "macos-arm64" ]]; then
             NPROC=$(sysctl -n hw.ncpu 2>/dev/null || echo 2)
           else
@@ -70,19 +83,17 @@ jobs:
           echo "NPROC=$NPROC" >> $GITHUB_ENV
           echo "Using $NPROC parallel jobs for builds"
 
-          # Set compiler when clang is requested
           if [[ "${{ inputs.compiler }}" == "clang" ]]; then
             echo "CC=clang" >> $GITHUB_ENV
             echo "CXX=clang++" >> $GITHUB_ENV
           fi
 
-          # Add Python user base bin to PATH for pip-installed CLI tools
-          echo "$(python -c 'import site; print(site.USER_BASE)')/bin" >> $GITHUB_PATH
+          echo "$($PYTHON -c 'import site; print(site.USER_BASE)')/bin" >> $GITHUB_PATH
         shell: bash
 
       - name: Install dependencies
         run: |
-          python -m pip install --upgrade pip \
+          $PYTHON -m pip install --upgrade pip \
             pybind11==3.0 \
             cmake==3.30.0 \
             ninja==1.11.1 \
@@ -97,7 +108,7 @@ jobs:
 
           CMAKE_GENERATOR="Unix Makefiles" \
           CMAKE_BUILD_PARALLEL_LEVEL="$NPROC" \
-          python -m pip install -v . \
+          $PYTHON -m pip install -v . \
             --no-build-isolation \
             --config-settings='cmake.define.BUILD_TOOLS="ON"' \
             ${{ matrix.arch_flag }}
@@ -112,7 +123,7 @@ jobs:
       - name: Run Python Tests
         run: |
           cd "$GITHUB_WORKSPACE"
-          python -m pytest python/tests/
+          $PYTHON -m pytest python/tests/
         shell: bash
 
       - name: Run C++ Examples