Update documentation CI task to build local packages

[dnanuti]

Update documentation CI task to build local packages

Description

Build local packages to fix import issue in docs generation task

Additional context

We have previously removed hard-coded version number as part of #104. This broke the docs generation workflow:

Configuration error:
There is a programmable error in your configuration file:

Traceback (most recent call last):
  File "/home/runner/.local/lib/python3.10/site-packages/sphinx/config.py", line 358, in eval_config_file
    exec(code, namespace)  # NoQA: S102
  File "/home/runner/work/s3-connector-for-pytorch/s3-connector-for-pytorch/s3torchconnector/docs/conf.py", line 14, in <module>
    from s3torchconnector import __version__
ModuleNotFoundError: No module named 's3torchconnector'

We are resolving this by installing the local packages before generating the documentation.

Related items

#104 broke the docs generation task, this PR is fixing it.

Testing

• Ran workflow from feature branch: https://github.com/awslabs/s3-connector-for-pytorch/actions/runs/7573720377

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