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Fix LXC network issues in Ubuntu 22.04

Ran into a curios problem while updating the GitHub Actions Workflow for the ansible-lxc-ssh project.

Greenplum Community Edition - Connections from the host system into the virtual machine

If you download the Greenplum Community Edition (GP CE) from the Greenplum website and if you want to connect tools like pgAdminIII from your host machine to the database inside the virtual machine, you have to disable the firewall. The CE is installed on CentOS and by default the firewall is enabled and blocks connections from outside to most ports.

Here are the steps which are required to disable the firewall: