Document Podman Usage

The usage of [Podman](https://podman.io) and [`podman-compose`](https://github.com/containers/podman-compose) should be documented [here](https://getfoundry.sh/introduction/installation#using-foundry-with-docker) and if possible recommended. I tweeted about it [here]( https://x.com/pcaversaccio/status/1982750022232907998) why Podman is the better approach in a security-first ecosystem.