health: FLARE groups show up as a container on the controller

' sm121 health' read only 'docker ps', so a FLARE lane on dgx5-8 looked like four
free nodes. It now folds the orbit groups in (same probe the dashboard uses):
the controller node reports the group as 'Up (flare)' and the cluster reports
one busy node.

src/docker/health/collect.rs

@@ -126,6 +126,25 @@ async fn collect_cluster(config: &Config, cluster: &Cluster, dry_run: bool) -> H
         }
     }
 
+    // FLARE groups run without a docker container: fold them in so `health`
+    // shows the lane as busy on the controller (the dashboard does the same).
+    if config.flare.is_some() {
+        let (controller, groups) = crate::web::probe::flare_groups(config).await;
+        if let Some(ip) = controller {
+            let ctl_name = crate::web::flare_nodes::candidates(config)
+                .into_iter()
+                .find(|n| n.ssh_ip == ip)
+                .map(|n| n.name.clone());
+            for node in &mut nodes {
+                if Some(&node.name) == ctl_name.as_ref() {
+                    for (group, _) in &groups {
+                        node.containers.push(format!("{group}\tUp (flare)"));
+                    }
+                }
+            }
+        }
+    }
+
     let es = es_handle.await.unwrap_or_default();
     let verdict = verdict_for(&nodes, es.blocking_off);
     let tmux = crate::tmux::discover::tmux_health_for_cluster(config, cluster).await;