ci: add cron

Author: rbjorklin

tests/docker/replication.yml

@@ -72,10 +72,18 @@
       package:
         name: openssh-server
         state: present
+    - name: install cron
+      package:
+        name: cronie
+        state: present
     - name: ensure sshd is running
       systemd:
         name: sshd
         state: started
+    - name: ensure cron is running
+      systemd:
+        name: crond
+        state: started
 
     - import_role:
         name: ANXS.postgresql