Remove support for podman

[thomaseizinger]

We only support the official docker API. Maintaining support for different implementations is too much of a burden. We leave it up the actual client implementations (like podman) to successfully disguise them as docker.

This could f.e. be done by aliasing podman to docker or by writing a wrapper binary that provides a compatible interface.

[n-0]

I tried aliasing and in the java version of testcontainers it works, but here this runs into issues with bollard-stubs as podman's JSON schema differs from docker's. As an alternative writing a trait that is independent of the container client, whose actual implementation can be provided to testcontainers-rs, would be something nice!

[thomaseizinger]

I tried aliasing and in the java version of testcontainers it works, but here this runs into issues with bollard-stubs as podman's JSON schema differs from docker's.

From my PoV, this needs to be fixed either in podman or bollard-stubs then.

[kiview]

Hen @n-0, you said

I tried aliasing and in the java version of testcontainers it works

but this is very unlikely since we communicate with the Docker daemon over its REST API. Maybe you used the podman systemd service, that provides a daemon server?

[n-0]

yes I used the podman socket (not aliasing, my bad) as described on stack overflow