Docker-squash broken in recent environments

I use docker-squash as the last step of the build command. There’s been some changes to the build env, which broke the build script.

It now terminates with:

2024-07-11 21:40:25,930 root         ERROR    Could not create Docker client, please make sure that you specified valid parameters in the 'DOCKER_HOST' environment variable.
2024-07-11 21:40:25,930 root         ERROR    Error while creating the Docker client: Error while fetching server API version: Not supported URL scheme http+docker
2024-07-11 21:40:25,930 root         ERROR    Execution failed, consult logs above. If you think this is our fault, please file an issue: https://github.com/goldmann/docker-squash/issues, thanks!

Can you tell me what changed, how can I revert and what is the correct value for DOCKER_HOST?

I found a single issue in docker-squash about this, it requires setting the correct DOCKER_HOST value:

This is the related part of my yml file. As you can see, everything is pinned, yet it’s still broken:

version: 2.1

jobs:
  build_base:
    docker:
      - image: cimg/python:3.9

    steps:
      - setup_remote_docker:
          version: 20.10.24

      - run: pip install docker==6.1.3 docker-squash==1.1.0 --disable-pip-version-check

The solution was to upgrade all versions to latest.