DCD-880: Install postgresql as part of slingshot backup

roles/create_backups/tasks/amazon.yml

@@ -11,4 +11,9 @@
 
 - name: Install atlassian-slingshot
   yum:
-    name: atlassian-slingshot
+    name: atlassian-slingshot
+
+- name: Enable Postgresql from 'extras'
+  command: amazon-linux-extras install -y "postgresql{{ atl_amazon_extras_postgresql_version }}"
+  args:
+    creates: /usr/bin/psql

roles/create_backups/tasks/main.yml

@@ -0,0 +1,5 @@
+---
+- name: Install distro-specific backup support packages
+  include_tasks: "../../tasks/{{ ansible_distribution|lower }}.yml"
+
+  

roles/create_backups/tasks/ubuntu.yml

@@ -19,4 +19,9 @@
   apt:
     name: atlassian-slingshot
     update_cache: yes
+    state: present
+
+- name: Install postgresql
+  apt:
+    name: postgresql
     state: present