retry the authelia mint and the appservice render until the store answers, and let tuwunel retry

docs/integrations/matrix.md

@@ -171,6 +171,7 @@ The swarm secret store holds the registration's tokens, at
 `swarm-matrix-ctl appservice render` fetches them and renders the
 registration tuwunel loads as a credential onto the `hive-matrix`
 container's tmpfs, before tuwunel starts.
+A render that can't reach the store fails and retries, and tuwunel, which fails to start without the registration, retries until one has landed.
 `appservice sync` runs beside tuwunel on a timer. The store's tokens win:
 when they differ from the rendered copy, it rewrites it. It
 restarts tuwunel whenever the registration is newer than tuwunel's last