feat(element): support podman-based deployment

roles/element/README.md

@@ -6,10 +6,10 @@ Deploy the [element web-app](https://element.io/)
 using the following supported methods by setting `element_deployment_method` to it:
 
 - [`docker` (docs)](docs/docker.md) (default)
+- `podman`
 
 Planned deployment methods:
 
-- `podman`
 - `tarball`
 - `nginx`
 - `apache2`