Example gh-pages feature preview
This repo exists as a demo on how to deploy previews of all branches to GitHub Pages.
cleanup-gh-pages-previews package
In case you have a setup thats similar to this one I published the _beforeAdd.js script to npm.
# install script
npm i cleanup-gh-pages-previews
# configure it
GIT_REMOTE=origin \
PRODUCTION_BRANCH=main \
PREVIEW_FOLDER=preview \
`# use it with gh-pages` \
gh-pages --before-add cleanup-gh-pages-previews