ci: Parallelize packaging builds

Signed-off-by: Naren Dasan <naren@narendasan.com>
Signed-off-by: Naren Dasan <narens@nvidia.com>

.circleci/config.yml

@@ -754,6 +754,7 @@ jobs:
         type: string
       torch-build-index:
         type: string
+    parallelism: 4
     machine:
       image: ubuntu-2004-cuda-11.4:202110-01
     resource_class: gpu.nvidia.small
@@ -772,7 +773,7 @@ jobs:
                 command: |
                   cd ~/project/py/
                   cp ~/project/toolchains/ci_workspaces/WORKSPACE.x86_64.release.rhel ~/project/WORKSPACE
-                  docker run -it --rm --gpus all -v ~/project:/workspace/project torch_tensorrt_release_env /bin/bash /workspace/project/py/ci/build_whl.sh
+                  docker run -it --rm --gpus all -v ~/project:/workspace/project torch_tensorrt_release_env /bin/bash /workspace/project/py/ci/build_whl.sh $(cat /workspace/project/py/ci/build_manifest.txt | circleci tests split)
             - create-env:
                 os: "ubuntu2004"
                 platform: "x86_64"