Add Token for Conda RC Release (pytorch#481)

Summary:
Follow up PR for pytorch#472
The Test token is required to be added to `env` for the uploading step in workflow

Pull Request resolved: pytorch#481

Reviewed By: NivekT, bearzx

Differential Revision: D36782535

Pulled By: ejguan

fbshipit-source-id: 214ee664335b05c7689a7eb16b89bad77b90a233

.github/workflows/_build_test_upload.yml

@@ -304,6 +304,7 @@ jobs:
         env:
           CONDA_PYTORCHBOT_TOKEN: ${{ secrets.CONDA_PYTORCHBOT_TOKEN }}
           CONDA_NIGHTLY_PYTORCHBOT_TOKEN: ${{ secrets.CONDA_NIGHTLY_PYTORCHBOT_TOKEN }}
+          CONDA_TEST_PYTORCHBOT_TOKEN: ${{ secrets.CONDA_TEST_PYTORCHBOT_TOKEN }}
         run: |
           conda install -yq anaconda-client
           conda install -c conda-forge -yq jq