Allows setting pypi sources for private deployments

[coffeehb]

Thanks for sharing, it's a cool project. I plan to use this to instrument internal pypi and npm repositories。
Whether to add support for manually setting the pypi or npm source？

[jamessteel123]

Hi, you can download the packages from the repository and scan those files directly. For example

(guarddog) ~/s/guarddog ❯❯❯ wget https://files.pythonhosted.org/packages/70/8e/0e2d847013cb52cd35b38c009bb167a1a26b2ce6cd6965bf26b47bc0bf44/requests-2.31.0-py3-none-any.whl
...
2023-05-31 15:22:08 (3.59 MB/s) - ‘requests-2.31.0-py3-none-any.whl’ saved [62574/62574]

(guarddog) ~/s/guarddog ❯❯❯ guarddog pypi scan ./requests-2.31.0-py3-none-any.whl
Found 0 potentially malicious indicators scanning ./requests-2.31.0-py3-none-any.whl

(guarddog) ~/s/guarddog ❯❯❯

Is this sufficient for your use case?