fix(app): use CBR and correct sa

examples/k8s/deployment.yaml

@@ -14,6 +14,7 @@ spec:
       labels:
         app: metalcheck
     spec:
+      serviceAccountName: metalcheck-sa
       containers:
       - name: backend
         image: <your-ecr-repo>:latest
@@ -29,6 +30,7 @@ apiVersion: v1
 kind: Service
 metadata:
   name: metalcheck-backend
+  namespace: metalcheck
 spec:
   selector:
     app: metalcheck