Allow use of podman instead of docker

[Sorin Sbarnea]

This python package is awesome but currently it cannot be used with podman but it should be quite easy to make it recognize podman, or at least to have an option to make use of podman instead of docker as their APIs are compatible.

[Nikita Sobolev]

Good idea! Probably we can remove docker package and use subprocess with both docker and podman commands.

[Sorin Sbarnea]

I did not look at the code yet but it might be a good idea. For example I had to add paramiko to dependecies because my docker was remote and in that case is needed.

It might take some time but now that I known that podman support is welcomed, I might attempt to make a PR.

[Nikita Sobolev]

This would be awesome! Thank you!