Summary: Without this, our boilplate config gets deleted on every run: https://github.com/JamesIves/github-pages-deploy-action#additional-build-files- Pull Request resolved: https://github.com/facebook/flipper/pull/4335 Reviewed By: lblasa Differential Revision: D41548935 Pulled By: passy fbshipit-source-id: aea68dbb28ed07f0102be05695aa6f6225ef6e11