Update guides to cover podman

[yeekangc]

Update relevant guides to demonstrate the use of podman and OCI container runtimes.

e.g., update https://openliberty.io/guides/docker.html to show the use of podman or create a new guide demonstrating it if appropriate.

[irobins]

Beyond any specific podman guide, any Liberty guide that describes the use of docker (e.g. the getting-started Guide : https://openliberty.io/guides/getting-started.html#running-the-application-in-a-docker-container ) should be extended to accomodate the use of podman as an alternative to docker. From a command point of view, it should just be a case of replacing "docker" with "podman". Everything currently in the getting started guide, for example, works for podman as an alternative tp docker - except the liberty:devc maven goal (for which there is a specific separate issue).