add CentOS-8/RedHat-8 support

molecule/default/converge.yml

@@ -11,15 +11,15 @@
 
   pre_tasks:
     # The Fedora 30+ container images have only C.UTF-8 installed
-    - name: Set database locale if using Fedora 30+
+    - name: Set database locale if using Fedora 30+ or RedHat 8+
       set_fact:
         postgresql_databases:
           - name: example
             lc_collate: 'C.UTF-8'
             lc_ctype: 'C.UTF-8'
       when:
-        - ansible_distribution == 'Fedora'
-        - ansible_distribution_major_version >= '30'
+        - ( ansible_distribution == 'Fedora' and ansible_distribution_major_version >= '30') or
+          ( ansible_os_family == 'RedHat' and ansible_distribution_major_version == '8')
 
     - name: Update apt cache.
       apt: update_cache=true cache_valid_time=600

vars/RedHat-8.yml

@@ -0,0 +1,11 @@
+---
+__postgresql_version: "10"
+__postgresql_data_dir: "/var/lib/pgsql/data"
+__postgresql_bin_path: "/usr/bin"
+__postgresql_config_path: "/var/lib/pgsql/data"
+__postgresql_daemon: postgresql
+__postgresql_packages:
+  - postgresql
+  - postgresql-server
+  - postgresql-contrib
+postgresql_python_library: python3-psycopg2