on: [push]

jobs:
  ls:
    runs-on: docker
    steps:
      #
      # This Docker action creates the file SOMEFILE ...
      #
      - uses: https://code.forgejo.org/forgejo/test-setup-forgejo-docker@main
        with:
          args: ${{ github.workspace }}/SOMEFILE
      #
      # ... which then also exists in the job workspace
      # because both docker containers are automatically
      # sharing the volume that contains it.
      #
      - run: |
          test -f ${{ github.workspace }}/SOMEFILE