feat(ansible): add Docker host configuration with NFS mounts and utility packages

- Introduce Docker host configuration playbooks in `docker_host` role
  - Install Docker and Docker Compose via apt repository
  - Configure Docker user, group, and required directories (`/opt/docker`, `/media`)
  - Add NFS mounts for Docker data, series, movies, and songs directories
- Add extra utility packages (`bat`, `ripgrep`, `fd-find`, `screen`, `eza`, `neovim`)
- Set up and manage `bash_aliases` for user-friendly command replacements (`batcat`, `nvim`, `eza`)
- Enhance `/group_vars` and `/host_vars` for Docker-related settings and secure access
- Add `docker-host00` and `docker-host01` entries to production and staging inventories

Signed-off-by: Tuan-Dat Tran <tuan-dat.tran@tudattr.dev>

roles/docker_host/tasks/user_group_setup.yml

@@ -0,0 +1,14 @@
+---
+- name: Ensure group "docker" exists
+  ansible.builtin.group:
+    name: docker
+    state: present
+  become: true
+
+- name: Append the group docker to "{{ user }}"
+  ansible.builtin.user:
+    name: "{{ user }}"
+    shell: /bin/bash
+    groups: docker
+    append: true
+  become: true