Add variables for apt key-server and -ids

defaults/main.yml

@@ -126,6 +126,8 @@ mysql_users: []
 mysql_mariadb_version: '10.1'
 # See: https://downloads.mariadb.org/mariadb/repositories
 mysql_mariadb_repository: "http://ftp.igh.cnrs.fr/pub/mariadb/repo/{{ mysql_mariadb_version }}/debian"
+mysql_mariadb_key_server: "keyserver.ubuntu.com"
+mysql_mariadb_key_ids: ['0xcbcb082a1bb943db', '0xf1656f24c74cd1d8']
 
 # -------------------------------------
 # Percona

tasks/install/mariadb/upstream.yml

@@ -1,8 +1,8 @@
 ---
 
 - name: APT | Install MariaDB key
-  apt_key: keyserver="keyserver.ubuntu.com" id={{ item }} state=present
-  with_items: ['0xcbcb082a1bb943db', '0xf1656f24c74cd1d8']
+  apt_key: keyserver="{{ mysql_mariadb_key_server }}" id={{ item }} state=present
+  with_items: "{{ mysql_mariadb_key_ids }}"
 
 - name: APT | Add MariaDB repository
   apt_repository: repo='deb {{ mysql_mariadb_repository }} {{ ansible_distribution_release }} main' state=present