Two related additions for gating a cross-host service (garage WebUI on a
storage host) behind authentik without breaking on TLS or X-Forwarded-Host:
garage role:
- Add garage_webui_domains (list), mirroring garage_s3_domains. The
console router now accepts every entry, so a DMZ reverseproxy can use a
backend_host whose cert SAN matches an internal *.int.* name instead of
connecting by IP (which fails acme cert verification). Defaults to the
single garage_webui_domain so existing inventories are unaffected.
authentik_outpost_proxy role (new):
- Standalone proxy (ForwardAuth) outpost, modelled on authentik_outpost_ldap.
Co-locate it with the protected service so the ForwardAuth subrequest
reaches authentik over the local docker network. The embedded outpost
only works for services on the authentik host: a cross-host subrequest
routed through an extra reverse-proxy hop arrives with a polluted
X-Forwarded-Host (port/comma-appended), which the outpost no longer
matches against the provider's external_host (404).
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