feat: Add Backstage app

Author: quiiver

repositories.yaml

@@ -2092,3 +2092,20 @@ applications:
     moz_pipeline_metadata_defaults:
       expiration_policy:
         delete_after_days: 400
+
+  - app_name: mozilla_backstage
+    canonical_app_name: Mozilla Service Catalog
+    app_description: Mozilla Service Catalog (Backstage)
+    url: https://github.com/mozilla-services/moz-backstage-app
+    notification_emails:
+      [email protected]
+    metrics_files:
+      - plugins/glean/metrics.yaml
+    channels:
+      - v1_name: moz-backstage-dev
+        app_id: moz_backstage
+        app_channel: development
+      - v1_name: moz-backstage-prod
+        app_id: moz_backstage
+        app_channel: production
+