Fix podman commands

[josecelano]

In the documentaion there are some commands that don't work, like:

• podman run -it torrust/tracker:develop
• podman run -it torrust/tracker:latest

$ podman run -it torrust/tracker:develop
Error: short-name "torrust/tracker:develop" did not resolve to an alias and no unqualified-search registries are defined in "/etc/containers/registries.conf"

The right way to execute it is:

$ podman run -it docker.io/torrust/tracker:develop

[josecelano]

Hi @da2ce7, the docker command is also wrong:

docker run -it torrust/tracker:latest

We are not publishing a latest tag. See https://hub.docker.com/r/torrust/tracker/tags.