"dependencies": {
    ...
    "webpack-stats-duplicates": "https://github.com/georgebatalinski/webpack-stats-duplicates"
  },
  "scripts": {
    ...
    "build": "npx webpack --profile --json > stats.json & npx webpack-stats-duplicates stats.json --json"
  },

name: blanky 

on:
  pull_request:
    branches: [ main ] #your branch goes here

jobs:
  duplicates:
    runs-on: ubuntu-latest
    name: Webpack duplicates
    steps:
      - uses: actions/checkout@v2 #we need to checkout the repo - sice we need ./blanky.json available 
      - name: check webpack bundle for duplicates
        uses: georgebatalinski/[email protected]
        with:
          myToken: ${{ secrets.PRIVATE_REPO_GITHUB_TOKEN }} #you will need a token - if its a private repo