Run `diff` against an uncommited file

[leovinsen]

Hi guys, thanks for the amazing product! I'm in the middle of POCing for my company's documentation needs. Deployment works well, but diff is not fully suited for my use case.

I am not committing the specs file into our repository and instead generate it in our CI workflow. Is it possible to run diff against the actual file inside the Github Action runner, similar to how deployment works?

name: diff OpenAPI
on:
  pull_request:
    branches:
      - development
jobs:
  api-diff:
    if: ${{ github.event_name == 'pull_request' }}
    name: Check API diff on Bump.sh
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v3

     - name: Generate OpenAPI specs
        run: // script to generate OpenAPI specs in ./openapi.json
        
      - name: Comment pull request with API diff
        uses: bump-sh/github-action@v1
        with:
          doc: <doc>
          token: ${{ secrets.BUMPSH_SECRET }}
          file: openapi.json
          command: diff
        env:
          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}