Fix CI on Fedora 30 containers

by forcing the use of the C.UTF-8 locale, which is all they have
installed by default

molecule/default/playbook.yml

@@ -10,6 +10,17 @@
       - name: jdoe
 
   pre_tasks:
+    # The Fedora 30+ container images have only C.UTF-8 installed
+    - name: Set database locale if using Fedora 30+
+      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'
+
     - name: Update apt cache.
       apt: update_cache=true cache_valid_time=600
       when: ansible_os_family == 'Debian'