Fix podman-compose run command parsing

[mariushoch]

This got confused with the main command (up, down, …), thus leading to:

    cmd = self.commands[cmd_name]
TypeError: unhashable type: 'list'

[muayyad-alsadi]

There is a similar docker-compose exec
Is there a common name that can be used for both run_command and exec_command?
Ex. cnt_command?

[mariushoch]

That sounds sensible, will change.