test-daemonize.yaml

name: Test daemonized worker
on:
  - workflow_dispatch
jobs:
  daemonize-test:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
      - name: daemonize return immediately
        run: |
          # Run the signal-ignoring utility script as a detached
          # daemonized process, trying to disown it completely.
          # It's probably sufficient to ( ./signaller.py & )
          # but setsid is more explicit and robust.
          setsid --fork python3 ./signaller.py SIGINT
      - name: look for pid file
        run: |
          while ! [ -e signaller.pid ]; do sleep 1; done
          cat signaller.pid
          ps -f -p "$(cat signaller.pid)"
          # we'll leave it running
      - name: wait a while
        run: |
          sleep 200
      - name: check pid again  
        run: |
          ps -f -p "$(cat signaller.pid)"
          # wonder how long it'll stay alive?
      - if: always()
        run: |
          cat signaller.log
          ps -efH