[feat]: Enable `add` to work with mTLS-protected registries

[peguerosdc]

Feature description

Hi! My use-case is the following:

At the company I work for, I want to create my own registry to distribute our component system. However, our internal servers require mTLS for any request, which means that if I wanted to consume the registry from my terminal, I would have to run something like:

curl -E ${CERTIFICATE_PATH} --cert-type ${CERTIFICATE_TYPE} https://host/r/component.json

So, when I try to hit it via npx shadcn@latest add ... I get an SSL error.

I know this is a very very specific request, but is there any chance this use-case could be supported? Would you be interested in it?

Affected component/components

No response

Additional Context

Additional details here...

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