Try reenabling container signing.

generic-pipelines/simple-ros-pipeline.yaml

@@ -43,5 +43,7 @@ spec:
       value: ./docker/Dockerfile
     - name: registry-login-secret-name
       value: $(params.registry-login-secret-name)
+    - names: cosign-secret-name
+      value: container-signing-secret
     taskRef:
       name: j7s-buildah