I have the following workflow defined, which enables concurrent skipping and then simply echoes whether a run has been skipped or not.

name: CI

on:
  push:
  pull_request:

jobs:
  find-duplicate-workflows:
    runs-on: [ self-hosted ]
    steps:
      - id: skip-check
        uses: fkirc/[email protected]
        with:
          concurrent_skipping: "same_content_newer"
          skip_after_successful_duplicate: "true"
      - run: echo ${{ steps.skip-check.outputs.should_skip }}

Now I add a new file that only exists in the main branch, and an additional file that only exists in a pr branch. Now I create a pull request to merge pr into main. The push triggers for both branches are ran as expected.

The pull_request triggers must not be skipped however, since the merge will contain both files, so the checked out contents differ from both main and pr. skip-duplicate-actions however reports should-skip = true.

See our test repo for a reproduction. Runs 6 and 11 are from push events, and 12 is from a pull_request trigger concurrent with its sibling push.