fix: revert change from yum to dnf for compatibility reasons (#32)

* fix: revert change from yum to dnf for compatibility reasons

* chore: noqa on yum to allow pipeline to pass

* fix: add conditional for using yum vs. dnf

* fix: fix conditionals, make comparisons more sensible

tasks/installation.yml

@@ -12,6 +12,16 @@
     name: https://pkg.adfinis-sygroup.ch/epel/epel-release-latest-{{ ansible_distribution_major_version }}.noarch.rpm
     state: present
   when: ansible_distribution == 'RedHat'
+    - ansible_os_family == 'RedHat'
+    - ansible_distribution_major_version | int > 7
+
+- name: Install fedora epel repository for CentOS < 8  # noqa fqcn[action-core]
+  ansible.builtin.yum:
+    name: https://pkg.adfinis-sygroup.ch/epel/epel-release-latest-{{ ansible_distribution_major_version }}.noarch.rpm
+    state: present
+  when:
+    - ansible_os_family == 'RedHat'
+    - ansible_distribution_major_version | int < 8
 
 - name: Deactivate the epel repository
   ansible.builtin.yum_repository:
@@ -121,7 +131,18 @@
     name: "{{ icinga2_agent_packages }}"
     enablerepo: "{{ icinga2_agent_packages_enablerepo }}"
     state: present
-  when: ansible_os_family == 'RedHat'
+  when:
+    - ansible_os_family == 'RedHat'
+    - ansible_distribution_major_version | int > 7
+
+- name: Install icinga 2 agent packages for CentOS < 8  # noqa fqcn[action-core]
+  ansible.builtin.yum:
+    name: "{{ icinga2_agent_packages }}"
+    enablerepo: "{{ icinga2_agent_packages_enablerepo }}"
+    state: present
+  when:
+    - ansible_os_family == 'RedHat'
+    - ansible_distribution_major_version | int < 8
 
 - name: Start and enable icinga2
   ansible.builtin.service: