Make utility registry require credentials about zarf HOT 4 CLOSED

@RothAndrew this would be a good high value task you could do without code changes I think

from zarf.

@RothAndrew moved this up in the roadmap because I feel it's a pretty important / lacking component for Zarf that shouldn't take any significant go changes.

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I'm planning on this being my next priority when I have more time to work on Zarf stuff. Currently still working on other projects.

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So Docker Registry uses htpasswd for password auth, which uses one-way hashes. Not as simple as just substituting ###ZARF_SECRET### with the password that Zarf creates.

Right now I'm thinking of maybe adding functionality to add parsing of ###ZARF_HTPASSWD### which would result in a proper htpasswd string like zarf-git-user:$2y$05$1oC7e2fbDJaMx7YEHIuPre90KBg2WQRRR2Ag4aE49buP7SQTu9kMS (that's the hash for the password foobar)

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