Tests are broken

[hadret]

New tests I introduced recently, for whatever reason, fail in CI pipelines -- on both GitLab and Travis:

    TASK [ansible-role-containers : setup the network(s)] **************************
    changed: [instance] => (item={'name': 'network-1'})
    
    TASK [ansible-role-containers : include_tasks] *********************************
    included: /home/gitlab-runner/builds/1dhPYUvK/0/hadret/ansible-role-containers/tasks/containers.yml for instance
    
    TASK [ansible-role-containers : deploy the container(s)] ***********************
    failed: [instance] (item={'name': 'hello-1', 'image': 'hello-world', 'state': 'started', 'restart_policy': 'always', 'networks': [{'name': 'network-1'}]}) => {"ansible_loop_var": "item", "changed": false, "item": {"image": "hello-world", "name": "hello-1", "networks": [{"name": "network-1"}], "restart_policy": "always", "state": "started"}, "msg": "Error creating container: 500 Server Error: Internal Server Error (\"error creating aufs mount to /var/lib/docker/aufs/mnt/b340d708451a880816c0b3921defdee2a30ce16a381fc7003cea2fae2d1eb465-init: mount target=/var/lib/docker/aufs/mnt/b340d708451a880816c0b3921defdee2a30ce16a381fc7003cea2fae2d1eb465-init data=br:/var/lib/docker/aufs/diff/b340d708451a880816c0b3921defdee2a30ce16a381fc7003cea2fae2d1eb465-init=rw:/var/lib/docker/aufs/diff/a158599c2b550f556906d5e506b38cf144321fd2738567eaec08139d66155556=ro+wh,dio,xino=/dev/shm/aufs.xino: invalid argument\")"}
    failed: [instance] (item={'name': 'hello-2', 'image': 'hello-world', 'state': 'started', 'restart_policy': 'always', 'networks': [{'name': 'network-1'}]}) => {"ansible_loop_var": "item", "changed": false, "item": {"image": "hello-world", "name": "hello-2", "networks": [{"name": "network-1"}], "restart_policy": "always", "state": "started"}, "msg": "Error creating container: 500 Server Error: Internal Server Error (\"error creating aufs mount to /var/lib/docker/aufs/mnt/040af0f7950b7089d51468b7d3542418e0b82e05f8d28dd9401214e083518945-init: mount target=/var/lib/docker/aufs/mnt/040af0f7950b7089d51468b7d3542418e0b82e05f8d28dd9401214e083518945-init data=br:/var/lib/docker/aufs/diff/040af0f7950b7089d51468b7d3542418e0b82e05f8d28dd9401214e083518945-init=rw:/var/lib/docker/aufs/diff/a158599c2b550f556906d5e506b38cf144321fd2738567eaec08139d66155556=ro+wh,dio,xino=/dev/shm/aufs.xino: invalid argument\")"}

I have no idea why those tests are working just fine locally (via Docker Desktop for Mac) 🤷‍♂ I'm going to keep this issue for tracking and will revert the tests until I (or somebody else) find a solution.