roles/mariadb: Use a template for sources

When you use the apt_repository module it adds a sources.list with
an annoying filename, and also it's just easier to use a template
when we have different distros/versions to support.

roles/mariadb/tasks/main.yml

@@ -4,7 +4,7 @@
   tags: mariadb
 
 - name: Add MariaDB 10.1 repo
-  apt_repository: repo="deb http://sgp1.mirrors.digitalocean.com/mariadb/repo/10.1/{{ ansible_distribution | lower }} {{ ansible_distribution_release }} main" state=present
+  template: src=mariadb.list.j2 dest=/etc/apt/sources.list.d/mariadb.list owner=root group=root mode=0644
   tags: mariadb
 
 - name: Install mariadb-server

roles/mariadb/templates/mariadb.list.j2

@@ -0,0 +1,10 @@
+{% if ansible_distribution == 'Ubuntu' and ansible_distribution_version == '16.04' %}
+
+# there are no xenial builds yet, so use wily
+deb [arch=amd64,i386] http://mariadb.mirror.serveriai.lt/repo/10.1/ubuntu wily main
+
+{% elif ansible_distribution == 'Debian' %}
+
+deb [arch=amd64,i386] http://mariadb.mirror.serveriai.lt/repo/10.1/debian {{ ansible_distribution_release }} main
+
+{% endif %} {# ansible_distribution #}