install needed packages

defaults/main.yml

@@ -3,4 +3,7 @@
 submodules_versioncheck: false
 
 postgresql_backup:
-  foo: bar
+  required_packages:
+    - postgresql-client
+  backup_dir: /var/backup/postgresql
+  date_format: '%Y-%m-%d_%H-%M'

tasks/main.yml

@@ -6,3 +6,4 @@
 - include_tasks: versioncheck.yml
   when: submodules_versioncheck|bool
 
+- include_tasks: packages.yml

tasks/packages.yml

@@ -0,0 +1,6 @@
+---
+- name: "Install PostgreSQL client"
+  become: true
+  package:
+    name: "{{ postgresql_backup.required_packages }}"
+    state: present

vars/main.yml

@@ -1,7 +1,8 @@
 ---
 # versionscheck
-playbook_version_number: 10 # should be int
+playbook_version_number: 12 # should be int
 playbook_version_path: 'role-postgresql-backup_roles-ansible_github.com.version' # unique string
 
 _postgresql_backup:
-  foo: bar
+  required_packages:
+    - postgresql-client