pull the images in a separate step so it doesn't take so long to build

.github/workflows/python_backend_tests.yaml

@@ -12,6 +12,9 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           pip install -r tests/python_backend/requirements.txt
+      - name: Download container
+        run: |
+          docker pull moyix/triton_with_ft:22.09
       - name: Run tests
         run: pytest tests