Resolving Issue #16669 - Anonymous OCI registry mirror support

[byjrack]

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them?

Currently an Authorization header is added to all requests for CurlGithubPackageDownload. It includes the contents of an ARTIFACT_TOKEN auth var or "A" which is used for access to ghcr.io. This causes an issue though if you host a private mirror of GHCR where auth is optional. This adds a conditional where for 7 of the 8 cases it adds the header, but for the 1 where you have a DOMAIN set and not TOKENs it will skip adding the header.

• Have you written new tests for your changes? Here's an example.

I couldn't figure out a great way to test this given the environmental aspects, but I am up for suggestions and can tweak the PR to fit.

• Have you successfully run brew style with your changes locally?
• Have you successfully run brew typecheck with your changes locally?
• Have you successfully run brew tests with your changes locally?

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[byjrack]

So may need a pointer on this one. Was able to get the style stuff taken care of, but not sure if I follow the issue with the tests output. Is that because i didn't add a new test for this specific scenario?

[byjrack]

Any maintainer have any pointers on what changes I need to add for the failed CI task? Happy to give it another shot, but not sure I am following what is being flagged.