keep authelia's oidc client secrets in the store, not on disk

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.

swarm-nats-auth/src/oidc_secret.rs

@@ -43,9 +43,7 @@ pub fn path(client_id: &str) -> Result<String> {
 /// When the store cannot be read, or holds nothing or only whitespace there.
 pub async fn read(store: &impl KeyStore, path: &str) -> Result<String> {
     let stored = store.read(path).await?.with_context(|| {
-        format!(
-            "nothing is stored at {path}; swarm-secret-publish in authelia's container writes it"
-        )
+        format!("nothing is stored at {path}; authelia's mint, in its container, writes it")
     })?;
     let trimmed = stored.trim();
     if trimmed.is_empty() {