container: support bind mounted db data directory and mysql config

roles/container/tasks/volumes.yml

@@ -3,18 +3,7 @@
 - name: Create directories and put files in them
   when: create_mounts_directory
   block:
-    - name: Set docker_mounts_dir
-      set_fact:
-        docker_mounts_dir: "{{ container_workdir }}/mounts"
- 
-    - name: Create directory {{ docker_mounts_dir }}
-      file:
-        path: "{{ docker_mounts_dir }}"
-        state: directory
-        owner: "{{ user.uid | default(omit) }}"
-        group: "{{ user.group | default(omit) }}"
-        mode: 0700
-    - name: Define mounts directory owner
+    - name: Define mount directory owner
       set_fact:
         mount_owner: "{{ user.uid if docker_host_user else image_user | default('') }}"
         mount_group: "{{ user.group if docker_host_user else '' }}"