Add rustup target add x86_64-apple-darwin [cd build]

Author: bact

.github/workflows/build-python-wheels.yml

@@ -161,6 +161,11 @@ jobs:
       uses: actions-rust-lang/setup-rust-toolchain@v1
       # For Linux, Rust will be installed inside a cibuildwheel container later
 
+    - name: Setup rustup target
+      if: startsWith(matrix.os, 'macos-')
+      run: rustup target add x86_64-apple-darwin
+      # For cross-compile x86 on GitHub arm64 runner
+
     - name: Build Python wheels
       uses: pypa/cibuildwheel@v2.21.3
       with: