ci: add extra-index

Author: GdoongMathew

.github/workflows/ci-tests-pytorch.yml

@@ -139,7 +139,7 @@ jobs:
           pip install ".[${EXTRA_PREFIX}extra,${EXTRA_PREFIX}test,${EXTRA_PREFIX}strategies]" \
             -U --upgrade-strategy=eager --prefer-binary \
             -r requirements/_integrations/accelerators.txt \
-            --extra-index-url="${TORCH_URL}" --find-links="${PYPI_CACHE_DIR}"
+            --extra-index-url="${TORCH_URL}" --find-links="${PYPI_CACHE_DIR}" --extra-index-url="https://download.pytorch.org/whl/torch-tensorrt"
           pip list
       - name: Drop LAI from extensions
         if: ${{ matrix.pkg-name != 'lightning' }}