fix: strip broken /opt/python from PATH on riscv64 RISE runners

Author: gounthar

.github/workflows/ci.yaml

@@ -166,6 +166,12 @@ jobs:
       uses: docker/setup-qemu-action@v3
       if: matrix.arch != 'x86_64' && matrix.arch != 'i686' && matrix.arch != 'aarch64' && matrix.arch != 'riscv64'
 
+    - name: fix Python path (riscv64)
+      if: matrix.arch == 'riscv64'
+      run: |
+        # Remove broken /opt/python from PATH (missing stdlib modules on RISE runners)
+        echo "PATH=$(echo "$PATH" | tr ':' '\n' | grep -v /opt/python | tr '\n' ':' | sed 's/:$//')" >> "$GITHUB_ENV"
+
     - name: build/test wheels
       id: build
       env: