r/unifi: Switching to custom container image

The _linuxserver.io_ image for UniFi Network is deprecated.  It sucked
anyway.  I've created a simple image based on Debian that installs the
_unifi_ package from the upstream apt repository.  This image doesn't
require running anything as _root_, so it doesn't need a user namespace.

roles/unifi/tasks/deploy.yml

@@ -1,48 +1,3 @@
-- name: ensure unifi group exists
-  group:
-    name: unifi
-    gid: 911
-    system: true
-    state: present
-  tags:
-  - user
-  - group
-- name: ensure unifi user exists
-  user:
-    name: unifi
-    uid: 911
-    group: unifi
-    home: /var/lib/unifi
-    createhome: false
-    system: true
-    state: present
-  tags:
-  - user
-
-- name: ensure containers subuid is configured
-  lineinfile:
-    path: /etc/subuid
-    create: true
-    line: containers:39290640:1048576
-  tags:
-  - user
-- name: ensure containers subgid is configured
-  lineinfile:
-    path: /etc/subgid
-    line: containers:39290640:1048576
-  tags:
-  - user
-
-- name: ensure unifi storage path exists
-  file:
-    path: '{{ unifi_storage_path }}'
-    owner: unifi
-    group: unifi
-    mode: u=rwx,go=
-    state: directory
-  tags:
-  - datadir
-
 - name: ensure unifi.container systemd unit exists
   template:
     src: unifi.container.j2