dokuwiki: add option to checkout custom design repo

roles/dokuwiki/tasks/main.yml

@@ -1,4 +1,4 @@
-- name: Install php-fpm
+- name: Install dependencies
   become: true
   ansible.builtin.apt:
     name:
@@ -9,6 +9,7 @@
       - php-intl
       - php-gd
       - php-sqlite3
+      - git
   diff: false
 
 - name: Ensure `php-fpm` is enabled
@@ -42,3 +43,17 @@
     owner: root
     group: root
     mode: "0644"
+
+- name: checkout custom theme git repo
+  become: true
+  ansible.builtin.git:
+    repo: "{{ dokuwiki__custom_theme_git_url }}"
+    dest: "{{ dokuwiki__installpath }}/lib/tpl/{{ dokuwiki__custom_theme_name }}"
+    version: "{{ dokuwiki__custom_theme_version }}"
+    force: true
+    depth: 1
+    single_branch: true
+    track_submodules: true
+  when:
+    - dokuwiki__custom_theme_git_url != ""
+    - dokuwiki__custom_theme_name != ""