Drop support for CentOS, test Rocky and Debian in CI (#92)

* Test CentOS 7 in CI

* Drop support for CentOS, test on Rocky and Debian

* Fix reset playbook for Rocky Linux

* Fix typo

* Disable firewalld during testing

Co-authored-by: Techno Tim <timothystewart6@gmail.com>

roles/reset/tasks/main.yml

@@ -50,14 +50,7 @@
   systemd:
     daemon_reload: yes
 
-- name: Remove linux-modules-extra-raspi
-  apt: name=linux-modules-extra-raspi state=absent
-
-- name: Remove tmp director used for manifests
+- name: Remove tmp directory used for manifests
   file:
     path: /tmp/k3s
     state: absent
-
-- name: Reboot and wait for node to come back up
-  reboot:
-    reboot_timeout: 3600