feat: add generic firewall rule to allow traffic between cluster members. That way, we hope that operation is not affected even if we switch iptables' default policy to DENY and set stricter rules

fix: install MediaArea packages only from official MediaArea repo

See merge request !4

fix: use of EPEL and MediaArea repos in CI

See merge request !3

fix: make sure rsinc is installed as a prerequisites for Ansible's `ansible.posix.synchronize` module

test: move testsuite over to Alma 8 from Rocky 8, because Rocky's Vagrant box seems to no longer be maintained

fix: use ansible.builtin.shell instead of ansible.builtin.command to be able to use Shell redirection for saving iptables rules