[Feature Request] Specify PyPi Repo for Package Installation

[diloreto]

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We need the ability to specify (in pipeline configuration) which Pypi repository to pull packages from. Many times a customer will want to only install local packages (that they've tested/scanned) instead of public versions. A good example is scipy or numpy. Can we please add a flag to either specify an internal URL (that obviously the pipeline can access) or PUBLIC?