Intermittent build failures

GitHub is experiencing an [ongoing issue](https://www.githubstatus.com/incidents/njb4tgwrkv34). Some Heroku customers are experiencing intermittent failures in auto-deploying apps using Heroku’s GitHub integration. As a workaround, impacted customers can get source code locally using `git clone` from GitHub or use a local working copy. Customers should ensure the `heroku remote` is set. If not, the remote can be set with `heroku git:remote -a `. Then, [deploy directly to Heroku](https://devcenter.heroku.com/articles/git) using `git push heroku main`. Customers may also experience intermittent failures in Heroku Review Apps. There is no known workaround for the failures in Heroku Review Apps.