Add Debian/Official Docker repo toggle

- Default docker_official toggle to false (for now)
- Preempt MariaDB restart before container restarts
- Start containers in a handler

roles/mariadb/handlers/main.yml

@@ -2,4 +2,11 @@
   ansible.builtin.service:
     name: mariadb
     state: restarted
+  when: not mariadb_restarted
+  listen: restart_mariadb
+
+- name: Set MariaDB as restarted
+  set_fact:
+    mariadb_restarted: true
+  when: not mariadb_restarted
   listen: restart_mariadb