Paperless backend test jobs on one Docker host.
Checkout:
https://github.com/paperless-ngx/paperless-ngx/tree/32bc5522e914f1e5f3a36eb60de6988611ca310f
Set PAPERLESS_ROOT to that checkout. run-two-backend-jobs.sh starts job-a and job-b from the same directory. Each job uses the repo file docker/compose/docker-compose.ci-test.yml the way the backend CI job does:
docker compose --file docker/compose/docker-compose.ci-test.yml up --detach