The mint creates each client's secret in the swarm secret store and writes only the digest to disk. It mints only when the store answers and holds none. A new unit moves the plaintext files an earlier release left into the store and removes each once the store holds the same value. The bridge reads its secret from the store into /run before each start. The secret publisher unit and its path unit are gone.
The three client registrations move into glue-{controller,nats,matrix}-oidc-client.nix,
gated only on deploy.authelia.enable and reading their ids from swarm.* options,
so the host running authelia registers every one of them whichever host runs
the service. The matrix callback is a new read-only swarm.matrix.sso.redirectUri,
read by both the homeserver's config and its client entry.
swarm-secret-publish now also publishes the queue's and the homeserver's minted
secrets to swarm/services/<id>/oidc/client. The queue host reads its responder's
secret there with swarm-bao-nats-auth-oidc under the responder's own leaf
(swarm-nats-auth role gains that one read path), and the homeserver's host with
swarm-bao-matrix-oidc under matrix-ctl's leaf (swarm-matrix-ctl role gains its
one read path). The host-file copies are gone: swarm-nats-auth-secrets now
delivers only the callout seeds and the store identity, and
hive-matrix-oidc-secret is removed. A fetch unit whose leaf is unset still
renders and fails naming the option pair.
Closes#4943
