Support explicit whitelisting of private-network upstreams - #223
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Depends on git-pkgs/registries#51.
Upstream fetches go through registries' dial gate which refuses connections to loopback and link-local addresses.
This currently makes using a deliberately-internal upstream impossible.
This PR exposes registries' new per-host opt-out in config:
or
PROXY_UPSTREAM_ALLOW_PRIVATE_HOSTS=host1,host2(comma-separated).