fix: ansible versions validation tasks

fix #840

Since a6712e3, ansible and jinja versions are
validated to ensure supported versions are used.
This validation is done by delegating `command` tasks to localhost, and parsing
the standard output of the executed commands, e.g. `ansible --version`.

The `ansible.builtin.command` module is not run when in check mode, causing the
variable which is supposed to get the result of the command to be empty,
resulting in an error message in the following tasks that parse these result
variables.

This commit ensures the `command` tasks are run even in check_mode. As they do
no modification on localhost, this is not dangerous.

tasks/validate/validate.yml

@@ -15,6 +15,7 @@
   changed_when: false
   delegate_to: localhost
   become: false
+  check_mode: false
 
 - name: Verify that you are using a supported Jinja2 version on your Ansible host
   ansible.builtin.assert:
@@ -30,6 +31,7 @@
   changed_when: false
   delegate_to: localhost
   become: false
+  check_mode: false
 
 - name: Verify that the 'community.general' Ansible collection is installed on your Ansible host
   ansible.builtin.assert: