The swarm's authelia has been a session / `auth_request` provider only.
SSO for the forge (and matrix behind it) needs the second role: an OIDC
provider that issues tokens to relying parties.
The provider is derived from `oidc.clients` rather than carrying its own
`enable`, because authelia refuses to start with a provider that has no
clients — a separate flag would be a second fact free to disagree with
the first. The list defaults to empty, so a hive that has not opted in
renders exactly what it rendered before.
Its two secrets are generated in-container by the existing first-boot
unit, which is the same test that unit already applies to the jwt,
session and storage keys: nothing outside this container reads them. The
hmac key is 64 random bytes and joins that loop; the issuer key is an RSA
pair, because it *signs* id tokens and relying parties verify them
against the public half at `/jwks.json` — a symmetric secret cannot serve
that.
No client secret appears here, and that is the point: a client secret has
two holders in two containers, and `settings` is rendered into the world-
readable nix store. Minting it is the next commit's problem.
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