container: support bind mounted db data directory and mysql config

roles/container/tasks/database.yml

@@ -28,6 +28,39 @@
     db_container_data: /data/db
   when: docker_database == 'mongo'
 
+- name: Reset db container mount definition var
+  set_fact:
+    db_container_mount_definition: []
+
+- name: Set up database container data bind mount
+  when: docker_volume_type == 'bind'
+  block:
+    - name: Create db data bind mount directory for {{ docker_service_name }}
+      file:
+        path: "{{ docker_mounts_dir }}/db"
+        state: directory
+
+    - name: Set db_container_mount_definition for db data bind mount
+      set_fact:
+        db_container_mount_definition: "{{ db_container_mount_definition + [{'source': docker_mounts_dir + '/db', 'target': db_container_data, 'type': 'bind'}] }}"
+
+- name: Set up database container config bind mount
+  when: db_config_mounts_needed
+  block:
+    - name: Put mariadb config in place
+      template:
+        src: mariadb.cnf.j2
+        dest: "{{ docker_mounts_dir }}/mariadb.cnf"
+
+    - name: Set db_container_mount_definition for db config bind mount
+      set_fact:
+        db_container_mount_definition: "{{ db_container_mount_definition + [{'source': docker_mounts_dir + '/mariadb.cnf', 'target': '/etc/mysql/conf.d/custom.cnf', 'type': 'bind', 'read_only': true}] }}"
+
+- name: Set db_container_mount_definition for db data named volume
+  set_fact:
+    db_container_mount_definition: "{{ db_container_mount_definition + [{'source': docker_service_name + '_db', 'target': db_container_data, 'type': 'volume'}] }}"
+  when: docker_volume_type == 'named'
+
 - name: Set db published ports var
   set_fact:
     db_published_ports: ["127.0.0.1:{{ ports[docker_service_name].db }}:{{ db_image_port }}"]
@@ -41,8 +74,6 @@
     env: "{{ db_container_env | default(omit) }}"
     published_ports: "{{ db_published_ports | default(omit) }}"
     restart_policy: always
-    mounts:
-      - source: "{{ docker_service_name + '_db' }}"
-        target: "{{ db_container_data }}"
+    mounts: "{{ db_container_mount_definition }}"
     networks: "{{ container_networks | default(omit) }}"
     log_driver: local