Add missing createPermissionIntegrationRouter call

We (the permission framework maintainers) updated the correct usage of createPermissionIntegrationRouter, but the docs remained outdated. As part of fixing the docs (https://github.com/backstage/backstage/pull/17388) we're making PRs to help fix the issue in community plugins as well.

Signed-off-by: Joon Park <joonp@spotify.com>

.changeset/sour-bulldogs-bow.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-playlist-backend': minor
+---
+
+Exposes the announcements plugin's permissions in a metadata endpoint.

plugins/playlist-backend/src/service/router.ts

@@ -112,6 +112,7 @@ export async function createRouter(
   };
 
   const permissionIntegrationRouter = createPermissionIntegrationRouter({
+    permissions: Object.values(permissions),
     getResources: resourceRefs =>
       Promise.all(resourceRefs.map(ref => dbHandler.getPlaylist(ref))),
     resourceType: PLAYLIST_LIST_RESOURCE_TYPE,