events-backend: allow unauthenticated requests to http ingress

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

.changeset/fuzzy-ducks-nail.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-events-backend': patch
+---
+
+Allow unauthenticated requests for HTTP ingress.

plugins/events-backend/src/service/EventsPlugin.ts

@@ -94,6 +94,10 @@ export const eventsPlugin = createBackendPlugin({
         const eventsRouter = Router();
         http.bind(eventsRouter);
         router.use(eventsRouter);
+        router.addAuthPolicy({
+          allow: 'unauthenticated',
+          path: '/http',
+        });
       },
     });
   },