enable rust doc

Author: tqchen

.github/workflows/publish_tvm_ffi_docs.yml

@@ -34,6 +34,7 @@ jobs:
         working-directory: tvm-ffi/
         env:
           BUILD_CPP_DOCS: 1
+          BUILD_RUST_DOCS: 1
         run: |
           uv run --group docs sphinx-build -M html docs docs/_build
           uv run --with requests python ../tvm-site/scripts/download_3rdparty_embeds.py -v --path=_build/html