Added vars to override systemd for mariabackup

Added variables ``galera_backups_full_init_overrides`` and
``galera_backups_increment_init_overrides`` that can be leveraged to
override default set of systemd unit file for mariadb backups.

Change-Id: Ib15c60dc577b376b1f761c4266eea89c4cb0be9f

defaults/main.yml

@@ -316,12 +316,14 @@ galera_mariadb_backups_path: "/var/backup/mariadb_backups"
 galera_mariadb_backups_full_copies: 2
 galera_mariadb_backups_full_on_calendar: "*-*-* 00:00:00"
 galera_mariadb_backups_full_randomized_delay_sec: 0
+galera_mariadb_backups_full_init_overrides: {}
 
 galera_mariadb_backups_increment_on_calendar:
   - "*-*-* 06:00:00"
   - "*-*-* 12:00:00"
   - "*-*-* 18:00:00"
 galera_mariadb_backups_increment_randomized_delay_sec: 0
+galera_mariadb_backups_increment_init_overrides: {}
 # galera_mariadb_backups_user is the name of the mariadb database user
 galera_mariadb_backups_user: galera_mariadb_backup
 galera_mariadb_backups_suffix: "{{ inventory_hostname }}"

releasenotes/notes/backups-systemd-override-e36d6bf010eb6b92.yaml

@@ -0,0 +1,7 @@
+---
+features:
+  - |
+    Added variables ``galera_backups_full_init_overrides`` and
+    ``galera_backups_increment_init_overrides`` that can be leveraged to override
+    default set of systemd unit file for mariadb backups.
+    Similar to change I7b3b0f4da047f82a49266ef57fba2fbaa24cebdc .

tasks/galera_server_backups.yml

@@ -31,6 +31,7 @@
   vars:
     systemd_service_enabled: true
     systemd_service_restart_changed: false
+    systemd_overrides: "{{ galera_mariadb_backups_full_init_overrides }}"
     systemd_user_name: "mysql"
     systemd_group_name: "{{ galera_mariadb_backups_group_name }}"
     systemd_services:
@@ -59,6 +60,7 @@
   vars:
     systemd_service_enabled: true
     systemd_service_restart_changed: false
+    systemd_overrides: "{{ galera_mariadb_backups_increment_init_overrides }}"
     systemd_user_name: "mysql"
     systemd_group_name: "{{ galera_mariadb_backups_group_name }}"
     systemd_services: