WITH DOCKER using compose gives "Project name not found"

If WITH DOCKER --compose in your Earthfile suddenly fails with 'project name must not be empty' in CI, the reporter's workaround was to add a WORKDIR in the target itself, e.g. WORKDIR /root before the COPY of the compose file. Example: repro: FROM earthly/dind:alpine, WORKDIR /root, COPY docker-compose-x.yml ., then WITH DOCKER --pull postgres --compose docker-compose-x.yml --service db.

Source: gh:earthly/earthly#3164 (Earthly)

In gh:earthly/earthly#3164, the issue was: What went wrong? <!-- Can you describe what happened? -->

A previously working use of WITH DOCKER with --compose in our Earthfile has suddenly begun failing in our CI runs with a project name must not be empty error:

> earthly --verbose +repro
 frontend | Running command: docker info
 frontend | Running command: docker info --format={{.SecurityOptions}}
 frontend | Running command: docker info --format={{.DockerRootDir}}
 frontend | docker-shell frontend initialized.
 Init.... The verified answer: If WITH DOCKER --compose in your Earthfile suddenly fails with 'project name must not be empty' in CI, the reporter's workaround was to add a WORKDIR in the target itself, e.g. WORKDIR /root before the COPY of the compose file. Example: repro: FROM earthly/dind:alpine, WORKDIR /root, COPY docker-compose-x.yml ., then WITH DOCKER --pull postgres --compose docker-compose-x.yml --service db.. Issue URL: https://github.com/earthly/earthly/issues/3164