add python only linux x86-build

[lanluo-nvidia]

Description

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Fixes # (issue)

Type of change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project (You can use the linters)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas and hacks
• I have made corresponding changes to the documentation
• I have added tests to verify my fix or my feature
• New and existing unit tests pass locally with my changes
• I have added the relevant labels to my PR in so that relevant reviewers are notified

[cehongwang]

Can you also check https://github.com/pytorch/TensorRT/blob/lluo/add_python_only_workflow/tests/py/dynamo/models/_cross_runtime_load_helper.py
and
https://github.com/pytorch/TensorRT/blob/lluo/add_python_only_workflow/tests/py/dynamo/models/test_cross_runtime_serde.py
and see whether it makes sense

[cehongwang]

Can you rebase this on cross-serialization branch to test the new branch? Or should I rebase that one on this one