Set CARGO_ZIGBUILD_ZIG_PATH

Author: encounter

.github/workflows/build.yaml

@@ -151,7 +151,9 @@ jobs:
         uses: astral-sh/setup-uv@v6
       - name: Install cargo-zigbuild
         if: matrix.build == 'zigbuild'
-        run: uv tool install cargo-zigbuild==0.20.1 --with-executables-from ziglang==0.15.1
+        run: |
+          uv tool install cargo-zigbuild==0.20.1 --with-executables-from ziglang==0.15.1
+          echo "CARGO_ZIGBUILD_ZIG_PATH=python-zig" >> $GITHUB_ENV
       - name: Setup Rust toolchain
         uses: dtolnay/rust-toolchain@stable
         with: