
add support for credentials usage in combination with other mirroring features. previously `HOMEBREW_DOCKER_REGISTRY_TOKEN` and `HOMEBREW_DOCKER_REGISTRY_BASIC_AUTH_TOKEN` where only used in combination with `HOMEBREW_ARTIFACT_DOMAIN` which affects *all* curl download strategies. `HOMEBREW_BOTTLE_DOMAIN` is only used for bottle artifacts, whose mirror might also require credentials. this change removes the requirement of using `HOMEBREW_ARTIFACT_DOMAIN`. related to #13226
Library
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