Consider migrating away from docker-py

[dtrifiro]

While very convenient, docker-py is currently unmaintaned (see docker/docker-py#2989), so we might want to consider migrating away from it.

A solution which does not require introducing new dependencies would replacing the docker_client fixture with a wrapper calling docker through subprocess.run.

[dtrifiro]

It seems that development for docker-py resumed. I'll leave this open for now and get back to this in a few months

[dtrifiro]

Another point against docker-py is tag updating.
docker tags be updated automatically Dependabot or Renovate, when specified in docker-compose.yml or Dockerfile files, but since we define tags in the code, these tools won't work.

Migrating to pytest-docker could be a solution, although it could be tricky to only bring up specific containers.

[skshetry]

You can update the version that you have in the code using renovate’s regex manager.