buildpack-nginx/bin/ci-pre-deploy

#!/bin/sh -l
if [ "$IS_REVIEW_APP" = "true" ]; then
  echo "-----> Purging repo cache"
  ssh "$SSH_REMOTE" -- repo:purge-cache "$APP_NAME"

  echo "-----> Setting the buildpack to the current commit"
  echo "https://github.com/${GITHUB_REPOSITORY}.git#$GITHUB_SHA" > .buildpacks
  git add .buildpacks
  git config --global user.name 'Dokku Bot'
  git config --global user.email no-reply@dokku.com
  git commit -qm "feat: specify $GITHUB_SHA as buildpack"
fi