Don't use "info.IndexServerAddress" for authentication #10458
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The IndexServerAddress field was as part of the initial Windows implementation of the engine. For legal reasons, Microsoft Windows (and thus Docker images based on Windows) were not allowed to be distributed through non-Microsoft infrastructure. As a temporary solution, a dedicated "registry-win-tp3.docker.io" registry was created to serve Windows images.
Using separate registries was not an ideal solution, and a more permanent solution was created by introducing "foreign image layers" in the distribution spec, after which the "registry-win-tp3.docker.io" ceased to exist, and removed from the engine.
This replaces the code that calls out to the "/info" endpoint to use the GetAuthConfigKey() function instead.
Related PR in docker/cli:
docker/cli@b4ca1c7
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