Add linter step

bitbucket-pipelines.yml

@@ -25,6 +25,7 @@ definitions:
       script:
         - npm install --prefix client
         - npm run lint --prefix client
+        - npx run codegen # this will exit with an error code if errors are found, we can ignore the generated files
     - &unittest-python
       name: run python unit tests
       caches: