add pre/post tasks, add system dependence

tasks/main.yml

@@ -1,4 +1,15 @@
 ---
+- name: Gather variables for each operating system
+  include_vars: "{{ item }}"
+  with_first_found:
+    - "{{ ansible_distribution | lower }}-{{ ansible_distribution_version | lower }}.yml"
+    - "{{ ansible_distribution | lower }}-{{ ansible_distribution_major_version | lower }}.yml"
+    - "{{ ansible_os_family | lower }}-{{ ansible_distribution_major_version | lower }}.yml"
+    - "{{ ansible_distribution | lower }}.yml"
+    - "{{ ansible_os_family | lower }}.yml"
+  tags:
+    - always
+
 - name: Ensure certbot directories exists
   file:
     dest: "{{ item }}"
@@ -45,7 +56,7 @@
 
 - name: Ensure cron is installed
   package:
-    name: cron
+    name: "{{ cron_packages }}"
     state: installed
   when: letsencrypt_autorenew
 

vars/redhat-7.yml

@@ -0,0 +1,3 @@
+---
+cron_packages:
+  - cronie

vars/ubuntu.yml

@@ -0,0 +1,3 @@
+---
+cron_packages:
+  - cron