swarm: the notification router tells a PR's author when CI on it fails or is cancelled

swarm-controller/src/forge.rs

@@ -1892,6 +1892,14 @@ fn hook_registration(kind: DeliveryKind) -> (&'static [&'static str], HookScope<
             ],
             HookScope::Instance,
         ),
+        // Instance-wide too: the outcome of a CI run, which the router tells a
+        // PR's author about. A hook of its own, because Forgejo's hook edit
+        // never sets `workflow_run_*` events: a hook can only get them when it
+        // is created.
+        DeliveryKind::WorkflowRun => (
+            &["workflow_run_failure", "workflow_run_cancelled"],
+            HookScope::Instance,
+        ),
     }
 }
 
@@ -2244,10 +2252,15 @@ mod tests {
                 "pull_request_review_comment",
             ]
         );
+        assert_eq!(
+            events(DeliveryKind::WorkflowRun),
+            ["workflow_run_failure", "workflow_run_cancelled"]
+        );
         // The events a stored flow's source may name are the ones the hooks
         // deliver to the router.
         let mut routed = events(DeliveryKind::Issues);
         routed.extend(events(DeliveryKind::PullRequest));
+        routed.extend(events(DeliveryKind::WorkflowRun));
         routed.sort_unstable();
         let mut sources = swarm_wire::notify_flows::SOURCE_EVENTS
             .iter()