When building in production, as well as generating bundle javascripts, cloudformation for updating a key in parameter store is created. This key is used by the frontend to determine the path to the commercial bundle.
This is neccessary as the production bundle files have a hash in their paths for cache busting, so the path is not the same for each build.
As part of the CI process a build is created in riff-raff with the javascripts and cloudformation. When deployment is initiated in riff-raff (automatically on prod, or manually for PRs on CODE) the javascripts are uploaded to the dotcom static S3 bucket, and the cloudformation updating the bundlepath is executed.
Frontend perioducally checks the parameter store for the path to the commercial bundle, caching it for 1 minute. This is to avoid hitting the parameter store on every request.