nginx/server: Use 1.20 branch for EL8 hosts

roles/nginx/server/tasks/main.yml

@@ -2,7 +2,22 @@
 - name: include os-specific variables
   include_vars: "{{ ansible_os_family }}.yml"
 
-- name: install nginx packages
+- name: enable nginx:120 module
+  command:
+    argv:
+      - dnf
+      - module
+      - -y
+      - enable
+      - nginx:1.20
+    creates: /etc/dnf/modules.d/nginx.module
+    warn: false
+  when:
+    - ansible_os_family == "RedHat"
+    - ansible_distribution != "Fedora"
+    - ansible_distribution_major_version|int >= 8
+
+- name: install packages
   package:
     name: nginx
     state: installed