This commit refactors all the shell scripts to use `#!/usr/bin/env bash` instead of `#!/bin/bash`. This change ensures that the scripts will run with the system's default Bash interpreter, even if it is not located at the standard `/bin/bash` path.
This change ensures that the new Portainer container is created with the same ports as the
current configuration. It first checks the existing Portainer container to get the
current port mappings, and then uses those values when starting the new container.
This way, clients do not need to update any of their configurations when the Portainer
version is updated.
