fix: quote nvidia-modelopt requirement in build_conda.sh

[zhiminwei551]

What

Quote the nvidia-modelopt[torch]>=0.37.0 requirement in build_conda.sh.

Why

Without quotes, the shell parses > as stdout redirection:

pip install nvidia-modelopt[torch]>=0.37.0 --no-build-isolation

As a result, the version constraint is not passed to pip as intended, and a file named =0.37.0 can be created/truncated in the working directory.

pip documentation recommends quoting requirement specifiers in the shell when using >, <, or environment markers:
https://pip.pypa.io/en/stable/reference/requirement-specifiers/#examples

Tested

bash -n build_conda.sh

I also verified the shell parsing behavior with:

tmpdir="$(mktemp -d)"
cd "$tmpdir"

echo nvidia-modelopt[torch]>=0.37.0 --no-build-isolation
ls -la  # creates '=0.37.0'

rm -f '=0.37.0'
echo "nvidia-modelopt[torch]>=0.37.0" --no-build-isolation
ls -la  # does not create '=0.37.0'

[zhiminwei551]

I noticed that #1554 appears to address the same shell redirection issue. This PR includes a more detailed reproduction and testing notes, but I’m happy to close it if maintainers prefer to keep the older one.