refactor: open permissions

The mumble docker image has the uid and gid baked in at image creation.
In order for the application in the container to write to the mounted volume
we're opening permissions to the mumble data directory.

Refs: #620

roles/mumble/tasks/main.yaml

@@ -5,7 +5,9 @@
       file:
         path: "{{ item }}"
         state: directory
-        mode: "0755"
+        # The mumble image gets uid/gid at build time, and uses 1000 for both, by default.
+        # This ends up with permission denied on the data directory, unless we fully open the permissions.
+        mode: "0777"
       with_items:
         - "{{ mumble_data_directory }}"