Github Action to flush heroku build cache, when npm dependencies change

heroku-build-cache-buster.yml

---
name: Flush Heroku Build Cache

on:
  push:
    branches:
      - main
    paths:
      - yarn.lock

jobs:
  flush-build-cache:
    runs-on: ubuntu-latest
    steps:
      - name: Heroku Login
        run: |
          cat > ~/.netrc <<EOF
            machine api.heroku.com
              login $HEROKU_EMAIL
              password $HEROKU_API_KEY
          EOF
        env:
          HEROKU_EMAIL: ${{ secrets.HEROKU_EMAIL }}
          HEROKU_API_KEY: ${{ secrets.HEROKU_API_KEY }}
      - name: Install heroku:build plugin
        run: heroku plugins:install heroku-builds
      - name: Clear Heroku Build Cache
        run: heroku builds:cache:purge --app your-app-name --confirm your-app-name