fix: add option to install mergetool

defaults/main.yml

@@ -1,5 +1,8 @@
 ---
 
+git_install_merge_tool: false
+git_package_name_merge_tool: meld
+
 git_users: []
   # github:
   #   config:
@@ -9,4 +12,3 @@ git_users: []
   #       name: "root"
   #       email: root@localhost
   #       signingKey: gpg-fingerprint
-  

tasks/main.yml

@@ -4,10 +4,19 @@
   ansible.builtin.include_vars: "{{ ansible_os_family }}.yml"
 
 - name: Install git and dependencies
-  ansible.builtin.package:
-    name: "{{ item }}"
-    state: present
-  with_items: "{{ git_package_names }}"
+  vars:
+    _git_package_names: "{{ git_package_names }}"
+  block:
+  - name: Add merge tool
+    ansible.builtin.set_fact:
+      _git_package_names: "{{ _git_package_names + [ git_package_name_merge_tool ] }}"
+    when: git_install_merge_tool is defined and
+          git_install_merge_tool
+  - name: Install git and dependencies
+    ansible.builtin.package:
+      name: "{{ item }}"
+      state: present
+    with_items: "{{ _git_package_names }}"
 
 - name: Configure git
   ansible.builtin.include_tasks: git_user.yml